soc/amd/picasso/cpu: move get_cpu_count to common code

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I0690787f492d764a20a4219822eb10fb5cd86de0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50406
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/picasso/cpu.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <amdblocks/cpu.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/mp.h>
 #include <cpu/x86/mtrr.h>
@@ -41,11 +42,6 @@ static void pre_mp_init(void)
 	x86_mtrr_check();
 }
 
-int get_cpu_count(void)
-{
-	return 1 + (cpuid_ecx(0x80000008) & 0xff);
-}
-
 static void set_cstate_io_addr(void)
 {
 	msr_t cst_addr;