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/include/reg_script.h

@@ -369,8 +369,8 @@ struct reg_script_bus_entry {
 	REG_RES_RXW32(bar_, reg_, 0xffffffff, value_)
 
 
-#if IS_ENABLED(CONFIG_SOC_INTEL_BAYTRAIL) || \
-IS_ENABLED(CONFIG_SOC_INTEL_FSP_BAYTRAIL)
+#if CONFIG(SOC_INTEL_BAYTRAIL) || \
+CONFIG(SOC_INTEL_FSP_BAYTRAIL)
 /*
  * IO Sideband Function
  */