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>
diff --git a/src/soc/rockchip/rk3399/clock.c b/src/soc/rockchip/rk3399/clock.c
index 586eaf0..5252232 100644
--- a/src/soc/rockchip/rk3399/clock.c
+++ b/src/soc/rockchip/rk3399/clock.c
@@ -660,7 +660,7 @@
 	}
 	rkclk_set_pll(&cru_ptr->dpll_con[0], &dpll_cfg);
 
-	if (IS_ENABLED(CONFIG_RK3399_SPREAD_SPECTRUM_DDR))
+	if (CONFIG(RK3399_SPREAD_SPECTRUM_DDR))
 		rkclk_set_dpllssc(&dpll_cfg);
 }