staging: rtl8188eu: Rename function ReadEFuseByIC() to efuse_ReadEFuse()

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

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