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/configs/zynq_cse_qspi_defconfig b/configs/zynq_cse_qspi_defconfig
index a767224..215d5ed 100644
--- a/configs/zynq_cse_qspi_defconfig
+++ b/configs/zynq_cse_qspi_defconfig
@@ -6,7 +6,7 @@
 CONFIG_SYS_DCACHE_OFF=y
 CONFIG_SYS_L2CACHE_OFF=y
 CONFIG_ARCH_ZYNQ=y
-CONFIG_SYS_TEXT_BASE=0xFFFC0000
+CONFIG_TEXT_BASE=0xFFFC0000
 CONFIG_SYS_MALLOC_LEN=0x1000
 CONFIG_ENV_SIZE=0x190
 CONFIG_DEFAULT_DEVICE_TREE="zynq-cse-qspi-single"