staging: sm750fb: rename `hw_sm750_crtc_setMode`

Rename `hw_sm750_crtc_setMode` to `hw_sm750_crtc_set_mode` to conform
with kernel style guidelines as reported by checkpatch.pl

CHECK: Avoid CamelCase: <hw_sm750_crtc_setMode>

Signed-off-by: Eric Florin <ericflorin@google.com>
Link: https://lore.kernel.org/r/40d4a1f5b05bcb0eefdd787b9df329fceb96105e.1747619816.git.ericflorin@google.com


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