Rename CONFIG_SYS_TEXT_BASE to CONFIG_TEXT_BASE

The current name is inconsistent with SPL which uses CONFIG_SPL_TEXT_BASE
and this makes it imposible to use CONFIG_VAL().

Rename it to resolve this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-octeontx2/cpu.c b/arch/arm/mach-octeontx2/cpu.c
index afa458c..723deef 100644
--- a/arch/arm/mach-octeontx2/cpu.c
+++ b/arch/arm/mach-octeontx2/cpu.c
@@ -51,7 +51,7 @@
 void mem_map_fill(void)
 {
 	int banks = OTX2_MEM_MAP_USED;
-	u32 dram_start = CONFIG_SYS_TEXT_BASE;
+	u32 dram_start = CONFIG_TEXT_BASE;
 
 	for (int i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 		otx2_mem_map[banks].virt = dram_start;