allwinner: Fix non-default PRELOADED_BL33_BASE

While the Allwinner platform code nominally supported a custom
PRELOADED_BL33_BASE, some references to the BL33 load address used
another constant: PLAT_SUNXI_NS_IMAGE_OFFSET. To allow the DTB search
code to work if a U-Boot BL33 is loaded to a custom address,
consistently use PRELOADED_BL33_BASE. And to avoid this confusion in
the future, remove the other constant.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: Ie6b97ae1fdec95d784676aef39200bef161471b0
diff --git a/plat/allwinner/common/sunxi_common.c b/plat/allwinner/common/sunxi_common.c
index 0ca18ad..39dc6f9 100644
--- a/plat/allwinner/common/sunxi_common.c
+++ b/plat/allwinner/common/sunxi_common.c
@@ -27,7 +27,7 @@
 			MT_DEVICE | MT_RW | MT_SECURE | MT_EXECUTE_NEVER),
 	MAP_REGION(SUNXI_DRAM_BASE, SUNXI_DRAM_VIRT_BASE, SUNXI_DRAM_SEC_SIZE,
 		   MT_RW_DATA | MT_SECURE),
-	MAP_REGION(PLAT_SUNXI_NS_IMAGE_OFFSET,
+	MAP_REGION(PRELOADED_BL33_BASE,
 		   SUNXI_DRAM_VIRT_BASE + SUNXI_DRAM_SEC_SIZE,
 		   SUNXI_DRAM_MAP_SIZE,
 		   MT_RO_DATA | MT_NS),
@@ -39,15 +39,6 @@
 	return SUNXI_OSC24M_CLK_IN_HZ;
 }
 
-uintptr_t plat_get_ns_image_entrypoint(void)
-{
-#ifdef PRELOADED_BL33_BASE
-	return PRELOADED_BL33_BASE;
-#else
-	return PLAT_SUNXI_NS_IMAGE_OFFSET;
-#endif
-}
-
 void sunxi_configure_mmu_el3(int flags)
 {
 	mmap_add_region(BL_CODE_BASE, BL_CODE_BASE,