Staging: sm750fb: Rename displayControlAdjust_SM750E

Rename function displayControlAdjust_SM750E to
display_control_adjust_SM750E. This follows snakecase naming convention
and ensures a consistent naming style throughout the file. Issue found by
checkpatch.

Mutes the following error:
CHECK:Avoid CamelCase: <displayControlAdjust_SM750E>
Signed-off-by: Dorcas AnonoLitunya <anonolitunya@gmail.com>
Link: https://lore.kernel.org/r/20231016201434.7880-2-anonolitunya@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/ddk750_mode.c

@@ -14,7 +14,7 @@
  * in bit 29:27 of Display Control register.
  */
 static unsigned long
-displayControlAdjust_SM750LE(struct mode_parameter *pModeParam,
+display_control_adjust_SM750LE(struct mode_parameter *pModeParam,
 			       unsigned long dispControl)
 {
 	unsigned long x, y;
@@ -125,7 +125,7 @@ static int programModeRegisters(struct mode_parameter *pModeParam,
 			tmp |= DISPLAY_CTRL_HSYNC_PHASE;
 
 		if (sm750_get_chip_type() == SM750LE) {
-			displayControlAdjust_SM750LE(pModeParam, tmp);
+			display_control_adjust_SM750LE(pModeParam, tmp);
 		} else {
 			reg = peek32(CRT_DISPLAY_CTRL) &
 				~(DISPLAY_CTRL_VSYNC_PHASE |