s_defconfig: S board has no WL12xx

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
s_defconfig: select ARM_ERRATA_775420

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Merge branch 'boundary-imx_3.0.35_4.1.0' of github.com:boundarydevices/linux-imx6 into boundary-imx_3.0.35_4.1.0