clk: renesas: r8a77965: Add SATA clock

This patch adds SATA clock to the R8A77965 SoC.

Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[wsa: rebased to upstream base]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>