staging: sm750fb: rename `hw_sm750le_deWait`

Rename `hw_sm750le_deWait` to `hw_sm750le_de_wait` to conform with
kernel style guidelines as reported by checkpatch.pl

CHECK: Avoid CamelCase: <hw_sm750le_deWait>

Signed-off-by: Eric Florin <ericflorin@google.com>
Link: https://lore.kernel.org/r/0e5332f7758ad24cc5bca36671fd811c87881db7.1747619816.git.ericflorin@google.com


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