refactor(plat/arm): rename ARM_DTB_DRAM_NS region macros

The macros PLAT_HW_CONFIG_DTB_BASE and PLAT_HW_CONFIG_DTB_SIZE
describe the range of memory where the HW_CONFIG_DTB can be loaded
rather than the actual load address and size of the DTB. This patch
changes the names to something more descriptive.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I98b81f3ce0c80fd76614f959667c25b07941e190
2 files changed