ec/google: Add command to fetch SKU ID from EC

BUG=b:64468585
BRANCH=none
TEST=with the other sku-id related patches applied, coreboot obtains the
right SKU ID from EC

Change-Id: I82e324407b4b96495a3eb3d4caf110f9eae05116
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/20946
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/ec/google/chromeec/ec.c

@@ -386,6 +386,24 @@ u16 google_chromeec_get_board_version(void)
 	return board_v.board_version;
 }
 
+u32 google_chromeec_get_sku_id(void)
+{
+	struct chromeec_command cmd;
+	struct ec_response_sku_id sku_v;
+
+	cmd.cmd_code = EC_CMD_GET_SKU_ID;
+	cmd.cmd_version = 0;
+	cmd.cmd_size_in = 0;
+	cmd.cmd_size_out = sizeof(sku_v);
+	cmd.cmd_data_out = &sku_v;
+	cmd.cmd_dev_index = 0;
+
+	if (google_chromeec_command(&cmd) != 0)
+		return 0;
+
+	return sku_v.sku_id;
+}
+
 int google_chromeec_vbnv_context(int is_read, uint8_t *data, int len)
 {
 	struct chromeec_command cec_cmd;

src/ec/google/chromeec/ec.h

@@ -49,6 +49,7 @@ void google_chromeec_check_pd_image(int expected_type);
 int google_chromeec_check_feature(int feature);
 uint8_t google_chromeec_calc_checksum(const uint8_t *data, int size);
 u16 google_chromeec_get_board_version(void);
+u32 google_chromeec_get_sku_id(void);
 u32 google_chromeec_get_events_b(void);
 int google_chromeec_clear_events_b(u32 mask);
 int google_chromeec_kbbacklight(int percent);