Staging: sm750fb: Rename programModeRegisters

Staging: sm750fb: Rename programModeRegisters

Rename function programModeRegisters to program_mode_registers. This
follows snakecase naming convention and ensures a consistent naming style
throughout the file. Issue found by checkpatch.

Mutes the following checkpatch error:
CHECK: Avoid CamelCase: <programModeRegisters>

Signed-off-by: Dorcas AnonoLitunya <anonolitunya@gmail.com>
Link: https://lore.kernel.org/r/20231016201434.7880-5-anonolitunya@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>