MIPS: fw: Record prom memory

MIPS: fw: Record prom memory

boot_mem_map is nolonger exist so we need to maintain a list
of prom memory by ourselves.

Signed-off-by: Jiaxun Yang <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]