clk: renesas: r8a779g0: Add RPC-IF clock

Add the module clock used by the SPI Multi I/O Bus Controller (RPC-IF)
on the Renesas R-Car V4H (R8A779G0) SoC.

While at it, fix table alignment in the definition of the related
RPCSRC internal clock.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/f0609c82e742865be753b67a0a6080f193f405ad.1665583328.git.geert+renesas@glider.be