Revert "Disable IRQs in dwc_otg_hcd_qh_free" patch

Revert "Disable IRQs in dwc_otg_hcd_qh_free" patch because DWC_DMA_FREE should be called with enabled IRQs.

=========================================================================
[  300.944739] WARNING: at arch/arm/mm/dma-mapping.c:444 dma_free_coherent+0x1a0/0x204()                                            
[  300.960062] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_hwdep snd_seq_midi snd_seq_midi_event snd_rawmidi snd_pcm snd_p8
[  300.991090] [<c00153d8>] (unwind_backtrace+0x0/0xfc) from [<c0401f20>] (dump_stack+0x20/0x24)                                    
[  301.007152] [<c0401f20>] (dump_stack+0x20/0x24) from [<c002e8f8>] (warn_slowpath_common+0x5c/0x74)                               
[  301.023643] [<c002e8f8>] (warn_slowpath_common+0x5c/0x74) from [<c002e93c>] (warn_slowpath_null+0x2c/0x34)                       
[  301.040858] [<c002e93c>] (warn_slowpath_null+0x2c/0x34) from [<c0018b14>] (dma_free_coherent+0x1a0/0x204)                        
[  301.057991] [<c0018b14>] (dma_free_coherent+0x1a0/0x204) from [<c03038d0>] (__DWC_DMA_FREE+0x18/0x1c)                            
[  301.074774] [<c03038d0>] (__DWC_DMA_FREE+0x18/0x1c) from [<c02fe70c>] (dwc_otg_hcd_qh_free+0xbc/0xec)                            
[  301.091546] [<c02fe70c>] (dwc_otg_hcd_qh_free+0xbc/0xec) from [<c02f9698>] (dwc_otg_hcd_endpoint_disable+0xac/0xc0)              
[  301.109550] [<c02f9698>] (dwc_otg_hcd_endpoint_disable+0xac/0xc0) from [<c02fbcac>] (endpoint_disable+0x28/0x34)                 
[  301.127307] [<c02fbcac>] (endpoint_disable+0x28/0x34) from [<c02d69dc>] (usb_hcd_disable_endpoint+0x2c/0x30)                     
[  301.144698] [<c02d69dc>] (usb_hcd_disable_endpoint+0x2c/0x30) from [<c02d8fb0>] (usb_disable_endpoint+0x70/0x90)                 
[  301.162611] [<c02d8fb0>] (usb_disable_endpoint+0x70/0x90) from [<c02d901c>] (usb_disable_interface+0x4c/0x64)                    
[  301.180351] [<c02d901c>] (usb_disable_interface+0x4c/0x64) from [<c02d965c>] (usb_set_interface+0x154/0x244)                     
[  301.198129] [<c02d965c>] (usb_set_interface+0x154/0x244) from [<bf108970>] (snd_usb_pcm_close+0x4c/0x70 [snd_usb_audio])         
[  301.217082] [<bf108970>] (snd_usb_pcm_close+0x4c/0x70 [snd_usb_audio]) from [<bf1089b0>] (snd_usb_capture_close+0x1c/0x20 [snd_u)
[  301.237706] [<bf1089b0>] (snd_usb_capture_close+0x1c/0x20 [snd_usb_audio]) from [<bf0c38e4>] (snd_pcm_release_substream+0x64/0xb)
[  301.258411] [<bf0c38e4>] (snd_pcm_release_substream+0x64/0xb8 [snd_pcm]) from [<bf0c3970>] (snd_pcm_release+0x38/0x7c [snd_pcm]) 
[  301.278001] [<bf0c3970>] (snd_pcm_release+0x38/0x7c [snd_pcm]) from [<c00f5284>] (fput+0xc0/0x218)                               
[  301.294816] [<c00f5284>] (fput+0xc0/0x218) from [<c00f1644>] (filp_close+0x74/0x98)                                              
[  301.310277] [<c00f1644>] (filp_close+0x74/0x98) from [<c00f1728>] (sys_close+0xc0/0x114)                                         
[  301.326162] [<c00f1728>] (sys_close+0xc0/0x114) from [<c000e140>] (ret_fast_syscall+0x0/0x48)                                    
[  301.342456] ---[ end trace 90f17bd35cfc0b79 ]---