staging: sm750fb: fix checkpatch warning architecture specific defines should be avoided

Replace architecture-specific defines with CONFIG_X86 checks to improve portability and adhere to kernel coding standards.

Fixes checkpatch warning:
- CHECK: architecture specific defines should be avoided.

Changes made:
- Using CONFIG_X86 instead of i386 and x86.

---
Changes in v2:
- Moved the '} else {' into the ifdef to avoid the possibly empty
else branch

 drivers/staging/sm750fb/ddk750_chip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 02860d3ec365..025dae3756aa 100644
@@ -228,8 +228,8 @@ int ddk750_init_hw(struct initchip_param *p_init_param)
 		reg = peek32(VGA_CONFIGURATION);
 		reg |= (VGA_CONFIGURATION_PLL | VGA_CONFIGURATION_MODE);
 		poke32(VGA_CONFIGURATION, reg);
+#ifdef CONFIG_X86
 	} else {
-#if defined(__i386__) || defined(__x86_64__)
 		/* set graphic mode via IO method */
 		outb_p(0x88, 0x3d4);
 		outb_p(0x06, 0x3d5);

2.39.5