soc/intel/skylake: Fix comment

mainboard_silicon_init_params() is *not* meant for configuring GPIOs. It
should only be used to configure FSP options, which can not be
configured elsewhere.

Change-Id: Ia92d0d173af9c67600e93b473480967304772998
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48008
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/chip.c

@@ -434,7 +434,7 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 	soc_irq_settings(params);
 }
 
-/* Mainboard GPIO Configuration */
+/* Mainboard FSP Configuration */
 __weak void mainboard_silicon_init_params(FSP_S_CONFIG *params)
 {
 	printk(BIOS_DEBUG, "WEAK: %s/%s called\n", __FILE__, __func__);