amd/agesa/family15tn: Add Richland CPU ID

Add the AMD A8-660K APU.

Change-Id: I210a8ba962529c26a535965689672a46b09e325f
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13510
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/cpu/amd/agesa/family15tn/model_15_init.c

@@ -130,6 +130,7 @@ static struct device_operations cpu_dev_ops = {
 
 static struct cpu_device_id cpu_table[] = {
 	{ X86_VENDOR_AMD, 0x610f00 },	  /* TN-A0 */
+	{ X86_VENDOR_AMD, 0x610f31 },     /* RL-A1 (Richland) */
 	{ 0, 0 },
 };