configs: move CONFIG_SPL_TEXT_BASE to Kconfig

Moved CONFIG_SPL_TEXT_BASE to common/spl/Kconfig and migrate existing
values.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
[trini: Re-run migration]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/CHIP_defconfig b/configs/CHIP_defconfig
index 95c564c..f94de1f 100644
--- a/configs/CHIP_defconfig
+++ b/configs/CHIP_defconfig
@@ -6,6 +6,7 @@
 CONFIG_DRAM_TIMINGS_DDR3_800E_1066G_1333J=y
 CONFIG_USB0_VBUS_PIN="PB10"
 CONFIG_VIDEO_COMPOSITE=y
+CONFIG_SPL_TEXT_BASE=0x60
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_CMD_DFU=y
 CONFIG_CMD_USB_MASS_STORAGE=y