ARM: shmobile: Lager:add SPI FLASH support on QSPI

This patch enables Spansion S25FL512SAGMFIG11 chip on QSPI,
Add support for the QSPI interface on Lager.

Signed-off-by: Hiep Cao Minh <cm-hiep@jinso.co.jp>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>