Constify struct cpu_device_id instances

There is currently no case where a struct cpu_device_id instance needs
to be modified. Thus, declare all instances as const.

Change-Id: I5ec7460b56d75d255b3451d76a46df76a51d6365
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/22526
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/amd/pi/00630F01/model_15_init.c

@@ -124,7 +124,7 @@ static struct device_operations cpu_dev_ops = {
 	.init = model_15_init,
 };
 
-static struct cpu_device_id cpu_table[] = {
+static const struct cpu_device_id cpu_table[] = {
 	{ X86_VENDOR_AMD, 0x630f00 },	  /* KV-A0 */
 	{ X86_VENDOR_AMD, 0x630f01 },	  /* KV-A1 */
 	{ 0, 0 },

src/cpu/amd/pi/00660F01/model_15_init.c

@@ -124,7 +124,7 @@ static struct device_operations cpu_dev_ops = {
 	.init = model_15_init,
 };
 
-static struct cpu_device_id cpu_table[] = {
+static const struct cpu_device_id cpu_table[] = {
 	{ X86_VENDOR_AMD, 0x660f00 },
 	{ X86_VENDOR_AMD, 0x660f01 },
 	{ 0, 0 },

src/cpu/amd/pi/00730F01/model_16_init.c

@@ -108,7 +108,7 @@ static struct device_operations cpu_dev_ops = {
 	.init = model_16_init,
 };
 
-static struct cpu_device_id cpu_table[] = {
+static const struct cpu_device_id cpu_table[] = {
 	{ X86_VENDOR_AMD, 0x730F00 },
 	{ X86_VENDOR_AMD, 0x730F01 },
 	{ 0, 0 },