soc/amd/common: Add common function to get cpu count

This is the same for all supported AMD hardware.

Change-Id: Ic6b954308dbb4c5a2050f1eb8f15acb41d0b81bd
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67617
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/common/block/cpu/Makefile.inc

@@ -1,5 +1,7 @@
 subdirs-y += ./*
 ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_UCODE) += update_microcode.c
+romstage-y += cpu.c
+ramstage-y += cpu.c
 
 ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_UCODE),y)
 define add-ucode-as-cbfs

src/soc/amd/common/block/cpu/cpu.c

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/cpu.h>
+#include <amdblocks/cpu.h>
+
+int get_cpu_count(void)
+{
+	return 1 + (cpuid_ecx(0x80000008) & 0xff);
+}

src/soc/amd/common/block/cpu/noncar/cpu.c

@@ -8,11 +8,6 @@
 #include <smbios.h>
 #include <soc/iomap.h>
 
-int get_cpu_count(void)
-{
-	return 1 + (cpuid_ecx(0x80000008) & 0xff);
-}
-
 unsigned int smbios_processor_family(struct cpuid_result res)
 {
 	return 0x6b; /* Zen */

src/soc/amd/stoneyridge/cpu.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <amdblocks/cpu.h>
 #include <amdblocks/iomap.h>
 #include <amdblocks/mca.h>
 #include <amdblocks/reset.h>
@@ -42,11 +43,6 @@ static void pre_mp_init(void)
 	x86_mtrr_check();
 }
 
-static int get_cpu_count(void)
-{
-	return 1 + (cpuid_ecx(0x80000008) & 0xff);
-}
-
 static const struct mp_ops mp_ops = {
 	.pre_mp_init = pre_mp_init,
 	.get_cpu_count = get_cpu_count,