ARM: shmobile: r8a7790: Add SATA clocks

This adds SATA[01] clock support to R8A7790 SoC.

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