ARM: multi_v7_defconfig: Enable support for CFI NOR FLASH

Enable the config options needed to access the CFI NOR FLASH on the
APE6EVM board.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>