Staging: sm750fb: Rename ddk750_setModeTiming

Rename function ddk750_setModeTiming to ddk750_set_mode_timing. This
patch affects three files as the function is imported to other external
files.

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: <ddk750_setModeTiming>

Signed-off-by: Dorcas AnonoLitunya <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/sm750fb/ddk750_mode.c

···
 	return ret;
 }
 
-int ddk750_setModeTiming(struct mode_parameter *parm, enum clock_type clock)
+int ddk750_set_mode_timing(struct mode_parameter *parm, enum clock_type clock)
 {
 	struct pll_value pll;
 

drivers/staging/sm750fb/ddk750_mode.h

···
 	enum spolarity clock_phase_polarity;
 };
 
-int ddk750_setModeTiming(struct mode_parameter *parm, enum clock_type clock);
+int ddk750_set_mode_timing(struct mode_parameter *parm, enum clock_type clock);
 #endif

drivers/staging/sm750fb/sm750_hw.c

···
 		clock = SECONDARY_PLL;
 
 	pr_debug("Request pixel clock = %lu\n", modparm.pixel_clock);
-	ret = ddk750_setModeTiming(&modparm, clock);
+	ret = ddk750_set_mode_timing(&modparm, clock);
 	if (ret) {
 		pr_err("Set mode timing failed\n");
 		goto exit;