tree: More use accessor functions for struct region fields

Always use the high-level API region_offset() and region_sz()
functions. This excludes the internal `region.c` code as well
as unit tests. FIT payload support was also skipped, as it
seems it never tried to use the API and would need a bigger
overhaul.

Change-Id: I18f1e37a06783aecde9024c15876b67bfeed70ee
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79955
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/src/soc/qualcomm/sc7280/soc.c b/src/soc/qualcomm/sc7280/soc.c
index e6dbf21..783c557 100644
--- a/src/soc/qualcomm/sc7280/soc.c
+++ b/src/soc/qualcomm/sc7280/soc.c
@@ -19,7 +19,7 @@
 	void *start = NULL;
 	void *end = NULL;
 
-	ram_range(dev, 0, (uintptr_t)ddr_region->offset, ddr_region->size);
+	ram_range(dev, 0, (uintptr_t)region_offset(ddr_region), region_sz(ddr_region));
 	reserved_ram_range(dev, 1, (uintptr_t)_dram_soc, REGION_SIZE(dram_soc));
 	reserved_ram_range(dev, 2, (uintptr_t)_dram_wlan, REGION_SIZE(dram_wlan));
 	reserved_ram_range(dev, 3, (uintptr_t)_dram_wpss, REGION_SIZE(dram_wpss));