kernel: XHCI PCI quirks for kernel 3.12 and 3.13

This adds empty definitions for the PCI quirks functions when they 
should not be included in the kernel.
This is based on a patch by Daniel <daniel@makrotopia.org>

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39534 3c298f89-4303-0410-b956-a3cf2f4a3e73