CBMEM: Change declarations for initialization hooks

There are efforts to have bootflows that do not follow a traditional
bootblock-romstage-postcar-ramstage model. As part of that CBMEM
initialisation hooks will need to move from romstage to bootblock.

The interface towards platforms and drivers will change to use one of
CBMEM_CREATION_HOOK() or CBMEM_READY_HOOK(). Former will only be called
in the first stage with CBMEM available.

Change-Id: Ie24bf4e818ca69f539196c3a814f3c52d4103d7e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63375
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/soc/mediatek/common/memory.c

@@ -146,7 +146,7 @@ static void add_mem_chip_info(int unused)
 
 	fill_dram_info(mc, curr_ddr_info);
 }
-ROMSTAGE_CBMEM_INIT_HOOK(add_mem_chip_info);
+CBMEM_CREATION_HOOK(add_mem_chip_info);
 
 static int run_dram_blob(struct dramc_param *dparam)
 {