Add MSTP10 clocks to the R8A7794 device tree.

This patch is based on the commit ee914152 ("ARM: shmobile: r8a7791:
add MSTP10 support on DTSI").
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>