staging: rtl8188eu: Merge hal/usb_ops_linux.c into os_dep/usb_ops_linux.c

Consolidate all usb operation related functions in one file.

Signed-off-by: navin patidar <navin.patidar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>