plat: ti: k3: common: bl31_setup: Use BL31_SIZE instead of computing

We compute BL31_END - BL31_START on the fly, which is basically
BL31_SIZE. Lets just use the BL31_SIZE directly so that we dont
complicate PIE relocations when actual address is +ve and -ve offsets
relative to link address.

Signed-off-by: Nishanth Menon <nm@ti.com>
Change-Id: I5e14906381d2d059163800d39798eb39c42da4ec
diff --git a/plat/ti/k3/common/k3_bl31_setup.c b/plat/ti/k3/common/k3_bl31_setup.c
index ac4e60e..457c95d 100644
--- a/plat/ti/k3/common/k3_bl31_setup.c
+++ b/plat/ti/k3/common/k3_bl31_setup.c
@@ -101,7 +101,7 @@
 void bl31_plat_arch_setup(void)
 {
 	const mmap_region_t bl_regions[] = {
-		MAP_REGION_FLAT(BL31_START,           BL31_END            - BL31_START,           MT_MEMORY  | MT_RW | MT_SECURE),
+		MAP_REGION_FLAT(BL31_START,           BL31_SIZE,			          MT_MEMORY  | MT_RW | MT_SECURE),
 		MAP_REGION_FLAT(BL_CODE_BASE,         BL_CODE_END         - BL_CODE_BASE,         MT_CODE    | MT_RO | MT_SECURE),
 		MAP_REGION_FLAT(BL_RO_DATA_BASE,      BL_RO_DATA_END      - BL_RO_DATA_BASE,      MT_RO_DATA | MT_RO | MT_SECURE),
 #if USE_COHERENT_MEM