lib/fit_payload: Add coreboot tables support for FDT.

Copy code of depthcharge boot/coreboot.c and adapt it.

Tested on Cavium CN8100 EVB SFF, /sys/firmware/log is readable
and prints the log.

Change-Id: Ib714a021a24f51407558f484cd97aa58ecd43977
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/28104
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/src/lib/imd_cbmem.c b/src/lib/imd_cbmem.c
index 177d2ac..83d5c1f 100644
--- a/src/lib/imd_cbmem.c
+++ b/src/lib/imd_cbmem.c
@@ -299,10 +299,15 @@
 	void *baseptr = NULL;
 	size_t size = 0;
 
-	imd_region_used(cbmem_get_imd(), &baseptr, &size);
+	cbmem_get_region(&baseptr, &size);
 	bootmem_add_range((uintptr_t)baseptr, size, BM_MEM_TABLE);
 }
 
+void cbmem_get_region(void **baseptr, size_t *size)
+{
+	imd_region_used(cbmem_get_imd(), baseptr, size);
+}
+
 #if ENV_RAMSTAGE || (IS_ENABLED(CONFIG_EARLY_CBMEM_LIST) \
 	&& (ENV_POSTCAR || ENV_ROMSTAGE))
 /*