staging: sm750fb: rename `hw_sm750_deWait`

Rename `hw_sm750_deWait` to `hw_sm750_de_wait` to conform with kernel
style guidelines as reported by checkpatch.pl

CHECK: Avoid CamelCase: <hw_sm750_deWait>

Signed-off-by: Eric Florin <ericflorin@google.com>
Link: https://lore.kernel.org/r/2d94a42ca51de9fddddb64f74e217dfb2e0c7d1c.1747619816.git.ericflorin@google.com


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