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/chromebit_mickey_defconfig b/configs/chromebit_mickey_defconfig
index df94cac..932351d 100644
--- a/configs/chromebit_mickey_defconfig
+++ b/configs/chromebit_mickey_defconfig
@@ -3,7 +3,7 @@
 CONFIG_SYS_ARCH_TIMER=y
 # CONFIG_SPL_USE_ARCH_MEMCPY is not set
 CONFIG_ARCH_ROCKCHIP=y
-CONFIG_SYS_TEXT_BASE=0x00100000
+CONFIG_TEXT_BASE=0x00100000
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_DEFAULT_DEVICE_TREE="rk3288-veyron-mickey"
 CONFIG_SPL_TEXT_BASE=0xff704000