staging: sm750fb: use BIT macro for VGA_CONFIGURATION single-bit fields

Replace complex defintion of VGA_CONFIGURATION register fields with BIT()
macro and use open-coded implementation for VGA_CONFIGURATION
manipulations.
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/ddk750_chip.c

@@ -211,8 +211,7 @@ int ddk750_initHw(initchip_param_t *pInitParam)
 	if (getChipType() != SM750LE) {
 		/*	set panel pll and graphic mode via mmio_88 */
 		reg = PEEK32(VGA_CONFIGURATION);
-		reg = FIELD_SET(reg, VGA_CONFIGURATION, PLL, PANEL);
-		reg = FIELD_SET(reg, VGA_CONFIGURATION, MODE, GRAPHIC);
+		reg |= (VGA_CONFIGURATION_PLL | VGA_CONFIGURATION_MODE);
 		POKE32(VGA_CONFIGURATION, reg);
 	} else {
 #if defined(__i386__) || defined(__x86_64__)

drivers/staging/sm750fb/ddk750_reg.h

@@ -548,12 +548,8 @@
 
 #define VGA_CONFIGURATION                             0x000088
 #define VGA_CONFIGURATION_USER_DEFINE                 5:4
-#define VGA_CONFIGURATION_PLL                         2:2
-#define VGA_CONFIGURATION_PLL_VGA                     0
-#define VGA_CONFIGURATION_PLL_PANEL                   1
-#define VGA_CONFIGURATION_MODE                        1:1
-#define VGA_CONFIGURATION_MODE_TEXT                   0
-#define VGA_CONFIGURATION_MODE_GRAPHIC                1
+#define VGA_CONFIGURATION_PLL                         BIT(2)
+#define VGA_CONFIGURATION_MODE                        BIT(1)
 
 #endif