staging: sm750fb: fix camelCase function name

Change camelCase function name sii164GetVendorID to sii164_get_vendor_id
as suggested by checkpatch.pl

Signed-off-by: Nam Cao <namcaov@gmail.com>
Link: https://lore.kernel.org/r/20220527225350.GA220436@nam-dell


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