Replace ENV_RAMSTAGE with ENV_PAYLOAD_LOADER

This patch relying on new rule, ENV_PAYLOAD_LOADER which is set
to ENV_RAMSTAGE.

This approach will help to add future optimization (rampayload) in
coreboot flow if required.

Change-Id: Ib54ece7b9e5f281f8a092dc6f38c07406edfa5fa
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32725
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: ron minnich <rminnich@gmail.com>

src/lib/imd_cbmem.c

@@ -307,7 +307,7 @@ void cbmem_get_region(void **baseptr, size_t *size)
 	imd_region_used(cbmem_get_imd(), baseptr, size);
 }
 
-#if ENV_RAMSTAGE || (CONFIG(EARLY_CBMEM_LIST) \
+#if ENV_PAYLOAD_LOADER || (CONFIG(EARLY_CBMEM_LIST) \
 	&& (ENV_POSTCAR || ENV_ROMSTAGE))
 /*
  * -fdata-sections doesn't work so well on read only strings. They all