arch/x86/include/cpu: introduce CPU_TABLE_END CPU table terminator

Instead of having a magic entry in the CPU device ID table list to tell
find_cpu_driver that it has reached the end of the list, introduce and
use CPU_TABLE_END. Since the vendor entry in the CPU device ID struct is
compared against X86_VENDOR_INVALID which is 0, use X86_VENDOR_INVALID
instead of the 0 in the CPU_TABLE_END definition.

TEST=Timeless build for Mandolin results in identical image.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Suggested-by: Angel Pons <th3fanbus@gmail.com>
Change-Id: I0cae6d65b2265cf5ebf90fe1a9d885d0c489eb92
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72888
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
diff --git a/src/soc/amd/stoneyridge/cpu.c b/src/soc/amd/stoneyridge/cpu.c
index 25549d0..39db1f4 100644
--- a/src/soc/amd/stoneyridge/cpu.c
+++ b/src/soc/amd/stoneyridge/cpu.c
@@ -62,7 +62,7 @@
 static struct cpu_device_id cpu_table[] = {
 	{ X86_VENDOR_AMD, CPUID_FROM_FMS(0x15, 0x60, 0), CPUID_ALL_STEPPINGS_MASK },
 	{ X86_VENDOR_AMD, CPUID_FROM_FMS(0x15, 0x70, 0), CPUID_ALL_STEPPINGS_MASK },
-	{ 0, 0, 0 },
+	CPU_TABLE_END
 };
 
 static const struct cpu_driver model_15 __cpu_driver = {