UPSTREAM: mb/google/bluey: Implement soc_id()

Implement soc_id() on Bluey using platform_get_soc_hw_id() to support
dynamic SoC identification (e.g. x1p42100, Hamoa) for payloads.

(cherry picked from commit 94bb5e1f89a7f3fae639fcf7c935f44b4fb5df2c)

BUG=none
TEST=Verify SoC ID on Google/Quenbi.
Original-Change-Id: I611f9618387ff1ad5ce5dee13ab8c0c5ca8d3a81
Original-Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Original-Reviewed-on: https://review.coreboot.org/c/coreboot/+/95117
Original-Reviewed-by: Subrata Banik <subratabanik@google.com>
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
GitOrigin-RevId: 94bb5e1f89a7f3fae639fcf7c935f44b4fb5df2c
Cr-Build-Id: 8672210772258787265
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8672210772258787265
Copybot-Job-Name: coreboot-main-copybot-downstream
Change-Id: I0271fa324037055ed707583d7e44d9ba94d02056
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/+/8310336
Tested-by: copybot@chops-service-accounts.iam.gserviceaccount.com <copybot@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: copybot@chops-service-accounts.iam.gserviceaccount.com <copybot@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: chromeos-auto-retry@chromeos-bot.iam.gserviceaccount.com <chromeos-auto-retry@chromeos-bot.iam.gserviceaccount.com>

src/mainboard/google/bluey/boardid.c

diff --git a/src/mainboard/google/bluey/boardid.c b/src/mainboard/google/bluey/boardid.c
index 4d4048a8..08e037c 100644
--- a/src/mainboard/google/bluey/boardid.c
+++ b/src/mainboard/google/bluey/boardid.c
@@ -4,6 +4,7 @@
 #include <ec/google/chromeec/ec.h>
 #include <gpio.h>
 #include <soc/cdt.h>
+#include <soc/platform_info.h>
 
 uint32_t board_id(void)
 {
@@ -43,3 +44,14 @@
 
 	return id;
 }
+
+uint32_t soc_id(void)
+{
+	static uint32_t id = UNDEFINED_STRAPPING_ID;
+	if (id != UNDEFINED_STRAPPING_ID)
+		return id;
+
+	id = platform_get_soc_hw_id();
+
+	return id;
+}