mfd: twl: Remove unused inline function twl4030charger_usb_en()

There is no caller in tree, so can remove it.

Signed-off-by: YueHaibing <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

include/linux/mfd/twl.h

···
 #define TWL4030_VAUX3_DEV_GRP		0x1F
 #define TWL4030_VAUX3_DEDICATED		0x22
 
-static inline int twl4030charger_usb_en(int enable) { return 0; }
-
 /*----------------------------------------------------------------------*/
 
 /* Linux-specific regulator identifiers ... for now, we only support