superio/ite/common/env_ctrl.c: fix IS_ENABLED argument

There was CONFIG_ prefix missing in SUPERIO_ITE_ENV_CTRL_FAN16_CONFIG
option, this patch fixes it.

Signed-off-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Change-Id: I52919671569175141560cb73e42344aa1725c112
Reviewed-on: https://review.coreboot.org/c/31674
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/superio/ite/common/env_ctrl.c b/src/superio/ite/common/env_ctrl.c
index 1dc5bb6..92c9bca 100644
--- a/src/superio/ite/common/env_ctrl.c
+++ b/src/superio/ite/common/env_ctrl.c
@@ -213,7 +213,7 @@
 		ite_ec_write(base, ITE_EC_FAN_CTL_MODE, reg);
 	}
 
-	if (IS_ENABLED(SUPERIO_ITE_ENV_CTRL_FAN16_CONFIG)
+	if (IS_ENABLED(CONFIG_SUPERIO_ITE_ENV_CTRL_FAN16_CONFIG)
 	    && conf->mode >= FAN_MODE_ON) {
 		reg = ite_ec_read(base, ITE_EC_FAN_TAC_COUNTER_ENABLE);
 		reg |= ITE_EC_FAN_TAC_16BIT_ENABLE(fan);