clk: shmobile: r8a7793: document CPG clock support

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
1 file changed