CPU: Declare cpu_phys_address_size() for all arch

Resource allocator and 64-bit PCI BARs will need it and
PCI use is not really restricted to x86.

Change-Id: Ie97f0f73380118f43ec6271aed5617d62a4f5532
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17733
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/arch/x86/include/arch/cpu.h

@@ -161,7 +161,6 @@ static inline unsigned int cpuid_edx(unsigned int op)
 
 int cpu_cpuid_extended_level(void);
 int cpu_have_cpuid(void);
-int cpu_phys_address_size(void);
 
 void smm_init(void);
 void smm_lock(void);

src/arch/x86/postcar_loader.c

@@ -16,6 +16,7 @@
 #include <arch/cpu.h>
 #include <cbmem.h>
 #include <console/console.h>
+#include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/mtrr.h>
 #include <program_loading.h>