coreboot: Replace all IS_ENABLED(CONFIG_XXX) with CONFIG(XXX)

This patch is a raw application of

 find src/ -type f | xargs sed -i -e 's/IS_ENABLED\s*(CONFIG_/CONFIG(/g'

Change-Id: I6262d6d5c23cabe23c242b4f38d446b74fe16b88
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31774
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/rockchip/common/pwm.c

@@ -67,7 +67,7 @@ void pwm_init(u32 id, u32 period_ns, u32 duty_ns)
 {
 	unsigned long period, duty;
 
-#if IS_ENABLED(CONFIG_SOC_ROCKCHIP_RK3288)
+#if CONFIG(SOC_ROCKCHIP_RK3288)
 	/*use rk pwm*/
 	write32(&rk3288_grf->soc_con2, RK_SETBITS(1 << 0));
 #endif