google/snappy: Update EC keyboard backlight flag by SKU ID

Set AP SKU ID by ec command EC_CMD_SET_SKU_ID to update EC keyboard backlight
flag.

BUG=b:65359225
BRANCH=reef
TEST=emerge-snappy coreboot
Change-Id: I1153aa0b89250c55f311dd93a01fcef47afd7292
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/21400
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/reef/mainboard.c

@@ -42,6 +42,8 @@ static void mainboard_init(void *chip_info)
 	gpio_configure_pads(pads, num);
 
 	mainboard_ec_init();
+
+	variant_board_ec_set_skuid();
 }
 
 /*
@@ -64,6 +66,11 @@ uint8_t __attribute__((weak)) variant_board_sku(void)
 	return board_sku_num;
 }
 
+/* Set variabnt board sku to ec by sku id */
+void __attribute__((weak)) variant_board_ec_set_skuid(void)
+{
+}
+
 const char *smbios_mainboard_sku(void)
 {
 	static char sku_str[7]; /* sku{0..255} */

src/mainboard/google/reef/variants/baseboard/include/baseboard/variants.h

@@ -38,6 +38,8 @@ const struct lpddr4_cfg *variant_lpddr4_config(void);
 size_t variant_memory_sku(void);
 /* Return board SKU. Limited to uint8_t, so it fits into 3 decimal digits */
 uint8_t variant_board_sku(void);
+/* Set variabnt board sku to ec by sku id */
+void variant_board_ec_set_skuid(void);
 
 /* Return ChromeOS gpio table and fill in number of entries. */
 const struct cros_gpio *variant_cros_gpios(size_t *num);

src/mainboard/google/reef/variants/snappy/Makefile.inc

@@ -0,0 +1 @@
+ramstage-y += mainboard.c

src/mainboard/google/reef/variants/snappy/mainboard.c

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016, 2017 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <baseboard/variants.h>
+#include <ec/google/chromeec/ec.h>
+
+void variant_board_ec_set_skuid(void)
+{
+	google_chromeec_set_sku_id(variant_board_sku());
+}