ARM: shmobile: lager: Add SATA support

This adds SATA support to Lager board. Only SATA1 port is available.

Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Acked-by: Magnus Damm <damm@opensource.se>
[horms+renesas@verge.net.au: resolved trivial conflicts]
[horms+renesas@verge.net.au: capitalised "ARM" in subject]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>