USB: Repair build warning for USB driver && I2C_MT65XX redefine.

WARNING: drivers/usb/host/built-in.o(.text+0x1dac4): Section mismatch in reference from the function mt_usb_init() to the (unknown reference) .init.data:(unknown)

Change-Id Ic8d0258953719d06c9de5f7591b38d98dec66e98
Signed-off-by: Yonglong Wu <yonglong.wu@mediatek.com>
Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>