soc/intel/cannonlake: Amend comment typo

Fix typo of "VGOIO" back to "VGPIO".

Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Change-Id: Ia2b7cb0e5fe2817acc3e3f4656b98dc2462b397f
Reviewed-on: https://review.coreboot.org/c/30147
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Bora Guvendik <bora.guvendik@intel.com>

src/soc/intel/cannonlake/include/soc/gpio_soc_defs.h

@@ -196,7 +196,7 @@
 #define GPP_H21			138
 #define GPP_H22			139
 #define GPP_H23			140
-/* Group VGOIO */
+/* Group VGPIO */
 #define GPIO_RSVD_13		141
 #define GPIO_RSVD_14		142
 #define GPIO_RSVD_15		143