ARM: imx: soc: Select default TEXT_BASE for i.MX6

Select default U-Boot and SPL text base for the i.MX6 SoC. The U-Boot
and SPL text base is picked as the one used by various i.MX6 boards.
Update all the boards.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 9a27eab..ed997d8 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -271,6 +271,7 @@
 	default 0x40200000 if OMAP34XX
 	default 0x402F4000 if AM43XX
 	default 0x402F0400 if AM33XX
+	default 0x00908000 if ARCH_MX6
 	default 0x40301350 if OMAP54XX
 	default 0x10060 if MACH_SUN50I || MACH_SUN50I_H5 || MACH_SUN9I
 	default 0x20060 if SUN50I_GEN_H6 || SUNXI_GEN_NCAT2