src: Update some incorrect config options in comments

This is a trivial patch to fix some comments that were generating
notes in the kconfig lint test.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I26a95f17e82910f50c62215be5c29780fe98e29a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47366
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/google/chromeec/ec_commands.h

@@ -1388,7 +1388,7 @@ enum ec_feature_code {
 	 */
 	EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS = 37,
 	/*
-	 * Early Firmware Selection ver.2. Enabled by CONFIG_VBOOT_EFS2.
+	 * Early Firmware Selection ver.2. Enabled by VBOOT_EFS2 config option.
 	 * Note this is a RO feature. So, a query (EC_CMD_GET_FEATURES) should
 	 * be sent to RO to be precise.
 	 */