ARM: shmobile: armadillo800eva: enable NEON on defconfig

The application / library will be stopped by illegal instruction
on current Armaddilo800eva board,
since defconfig doesn't have CONFIG_NEON.
This patch enabled it.
Special thanks to Ishiyama-san

Reported-by: Kiyoshi Ishiyama <kiyoshi.ishiyama.wg@renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Kiyoshi Ishiyama <kiyoshi.ishiyama.wg@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>