libpayload: Cache physical location of CBMEM entries

In the presence of self-relocating payloads, it's safer to keep
physical addresses in `libsysinfo`. This updates all the references
to CBMEM entries that are not consumed inside libpayload code.

Change-Id: I3be64c8be8b46d00b457eafd7f80a8ed8e604030
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43580
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

payloads/libpayload/include/coreboot_tables.h

@@ -396,6 +396,5 @@ static inline const char *cb_mb_part_string(const struct cb_mainboard *cbm)
 		+ (sizeof((_rec)->map[0]) * (_idx)))
 
 /* Helper functions */
-void *get_cbmem_ptr(unsigned char *ptr);
 uintptr_t get_cbmem_addr(const void *cbmem_tab_entry);
 #endif