staging: rtl8188eu: Rename rtl8188e_EfusePowerSwitch() to Efuse_PowerSwitch()

Rename rtl8188e_EfusePowerSwitch() to Efuse_PowerSwitch()
and remove original Efuse_PowerSwitch() function,
so that driver can call rtl8188e_EfusePowerSwitch() directly
without going through Efuse_PowerSwitch().

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