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/board/freescale/ls1028a/Kconfig b/board/freescale/ls1028a/Kconfig
index 5c27f0f..7d73d20 100644
--- a/board/freescale/ls1028a/Kconfig
+++ b/board/freescale/ls1028a/Kconfig
@@ -15,7 +15,7 @@
 config EMMC_BOOT
 	bool "Support for booting from EMMC"
 
-config SYS_TEXT_BASE
+config TEXT_BASE
 	default 0x96000000 if SD_BOOT || EMMC_BOOT
 	default 0x82000000 if TFABOOT
 	default 0x20100000
@@ -51,7 +51,7 @@
 config EMMC_BOOT
 	bool "Support for booting from EMMC"
 
-config SYS_TEXT_BASE
+config TEXT_BASE
 	default 0x96000000 if SD_BOOT || EMMC_BOOT
 	default 0x82000000 if TFABOOT
 	default 0x20100000