Use R8A77970 CPG core clock and SYSC pwoer domain macros

Hello!

Here's the set of 2 patches against Simon Horman's 'renesas.git' repo's 'renesas-devel-20171128-v4.15-rc1' tag. Now that the R8A77970 CPG core clock and SYSC power domain #define's have hit Linus' tree, we can replace the bare numbers (we had to use to avoid a cross tree dependencies) with these #define's, at last...

[1/2] arm64: dts: renesas: r8a77970: use CPG core clock macros [2/2] arm64: dts: renesas: r8a77970: use SYSC power domain macros

WBR, Sergei