ps8xxx: Add support for ps8815 A2 with bad FW
ps8xxx: Add support for ps8815 A2 with bad FW

This adds the low level chip ID of the ps8815 A2 so we can recognize the
chip when its main firmware is inoperative.

BRANCH=none
BUG=b:186189039
TEST=with next patch in series, verified the brya EC reports the correct
	device ID when the firmware is corrupted.

Change-Id: I2696b9c20fdefd8afd02f7394a45f1c4c5636d71
Signed-off-by: Caveh Jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2857796
Reviewed-by: Boris Mittelberg <46897f4fb5cad4b1d5146ad1fd460d7f4825bbf7@google.com>
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec