sunxi: move CONFIG_SYS_TEXT_BASE out of defconfigs

Commit 278b90ce786f ("configs: Migrate CONFIG_SYS_TEXT_BASE") made
CONFIG_SYS_TEXT_BASE a proper Kconfig variable, with the consequence
of moving the common definition shared by almost every sunxi board
into 123 individual defconfig files. But the U-Boot start address
for Allwinner boards is a platform decision which has been around for
ages, so defining it in each *board* config file seems a bit over the
top.
Define the standard values (160MB into DRAM for most SoCs, with two
SoC exceptions) if ARCH_SUNXI is selected, and delete the lines from
the individual defconfigs.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/Kconfig b/Kconfig
index 4354061..6670913 100644
--- a/Kconfig
+++ b/Kconfig
@@ -405,6 +405,9 @@
 	depends on !NIOS2 && !XTENSA
 	depends on !EFI_APP
 	default 0x80800000 if ARCH_OMAP2PLUS
+	default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
+	default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
+	default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 	hex "Text Base"
 	help
 	  The address in memory that U-Boot will be running from, initially.