staging: sm750fb: Add names to proc_setBLANK args

Add names to proc_setBLANK args.
Found using checkpatch.pl.

Signed-off-by: Igor Ribeiro Barbosa Duarte <igor.ribeiro.duarte@gmail.com>
Link: https://lore.kernel.org/r/20200526224750.GA29722@igor-Aspire-F5-573G


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