staging: sm750fb: change `enum dpms` to snake_case
Change the entries in `enum dpms` to snake_case in order to conform to
kernel code styles as reported by checkpatch.pl
CHECK: Avoid CamelCase: <crtDPMS_ON>
CHECK: Avoid CamelCase: <crtDPMS_STANDBY>
CHECK: Avoid CamelCase: <crtDPMS_SUSPEND>
CHECK: Avoid CamelCase: <crtDPMS_OFF>
Signed-off-by: Eric Florin <ericflorin.kernel@gmail.com>
Link: https://lore.kernel.org/r/20250423040345.11323-1-ericflorin.kernel@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>