staging: sm750fb: fix naming style

Fix CamelCase names defined in ddk750_dvi.c and ddk750_dvi.h, as
reported by checkpatch.pl. Remove name suffixes such as pfn_ and g_.

Signed-off-by: Nam Cao <cvn249@gmail.com>
Link: https://lore.kernel.org/r/20220316224940.70107-1-cvn249@gmail.com


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