defconfigs: Migrate CONFIG_SYS_REDUNDAND_ENVIRONMENT

Move this symbol to Kconfig.  As part of this we can drop a UBI-specific
symbol that was a stop-gap for not having this particular symbol in
Kconfig.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/apf27_defconfig b/configs/apf27_defconfig
index 2b82f05..650c2d2 100644
--- a/configs/apf27_defconfig
+++ b/configs/apf27_defconfig
@@ -39,6 +39,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=mxc_nand.0:1M(u-boot)ro,512K(env),512K(env2),512K(firmware),512K(dtb),5M(kernel),-(rootfs)"
 CONFIG_CMD_UBI=y
 CONFIG_ENV_IS_IN_NAND=y
+CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
 CONFIG_FPGA_XILINX=y
 CONFIG_FPGA_SPARTAN3=y
 CONFIG_MXC_GPIO=y