libpayload: Cache physical cbmem console address

Same as with other consoles and drivers that cache an address
outside the payload (e.g. video/corebootfb), we should store the
physical address, so we can derive the virtual address on demand.
This makes it save to use the address across relocations.

As a first step in migrating `libsysinfo` to `uintptr_t`, we
also switch to the physical address there.

Fixes the default build of FILO, tested with Qemu/i440FX and Qemu/Q35.

Change-Id: I4b8434af69e0526f78523ae61981a15abb1295b0
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37478
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

payloads/libpayload/include/coreboot_tables.h

@@ -31,6 +31,7 @@
 
 #include <arch/types.h>
 #include <ipchksum.h>
+#include <stdint.h>
 
 enum {
 	CB_TAG_UNUSED			= 0x0000,
@@ -396,4 +397,5 @@ static inline const char *cb_mb_part_string(const struct cb_mainboard *cbm)
 
 /* Helper functions */
 void *get_cbmem_ptr(unsigned char *ptr);
+uintptr_t get_cbmem_addr(const void *cbmem_tab_entry);
 #endif