configs: move CONFIG_SPL_TEXT_BASE to Kconfig

CONFIG_SPL_TEXT_BASE is moved to common/spl/Kconfig, update
pcl063_ull defconfig.

Signed-off-by: Parthiban Nallathambi <pn@denx.de>
diff --git a/configs/phycore_pcl063_ull_defconfig b/configs/phycore_pcl063_ull_defconfig
index 4b9bb36..b516248 100644
--- a/configs/phycore_pcl063_ull_defconfig
+++ b/configs/phycore_pcl063_ull_defconfig
@@ -8,6 +8,7 @@
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=8
 CONFIG_SPL=y
+CONFIG_SPL_TEXT_BASE=0x908000
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"