clk: renesas: r8a7795: Add RPC clocks

Describe the RPCSRC internal clock and the RPC[D2] clocks derived from
it, as well as the RPC-IF module clock, in the R-Car H3 (R8A7795)
CPG/MSSR driver.

Inspired by commit 94e3935b ("clk: renesas: r8a77980: Add RPC clocks").

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Link: https://lore.kernel.org/r/20200203072901.31548-1-dirk.behme@de.bosch.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>