Staging: rtl8192e: Rename function rtllib_MFIE_Grate()

Rename function rtllib_MFIE_Grate to rtllib_mfie_grate to fix checkpatch
warning Avoid CamelCase.

Signed-off-by: Tree Davies <tdavies@darkphysics.net>
Link: https://lore.kernel.org/r/20231223015942.418263-14-tdavies@darkphysics.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>