soc/intel/common/block/smm: Drop stale comment

This comment is most likely a copy-paste leftover from Braswell.

Change-Id: I49bfa3cc56539df0b47d2e2bd74b2bfc45421034
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52500
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/soc/intel/common/block/smm/smihandler.c

@@ -241,8 +241,6 @@ void smihandler_southbridge_sleep(
 		break;
 	}
 
-	/* Tri-state specific GPIOS to avoid leakage during S3/S5 */
-
 	/*
 	 * Write back to the SLP register to cause the originally intended
 	 * event again. We need to set BIT13 (SLP_EN) though to make the