soc/intel/cannonlake: Put braces around *else* branch

From `Documentation/coding_style.md`:

> This does not apply if only one branch of a conditional statement is a
> single statement; in the latter case use braces in both branches:

Change-Id: I5672949e587a9c0e4efa01521a659e4c224085d0
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42200
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/soc/intel/cannonlake/acpi.c

@@ -203,8 +203,9 @@ void acpi_create_gnvs(struct global_nvs_t *gnvs)
 		if (CONFIG(EC_GOOGLE_CHROMEEC)) {
 			gnvs->chromeos.vbt2 = google_ec_running_ro() ?
 				ACTIVE_ECFW_RO : ACTIVE_ECFW_RW;
-		} else
+		} else {
 			gnvs->chromeos.vbt2 = ACTIVE_ECFW_RO;
+		}
 	}
 
 	/* Enable DPTF based on mainboard configuration */