clk: renesas: r8a779g0: Add PCIe clocks

clk: renesas: r8a779g0: Add PCIe clocks

Add the PCIe module clocks, which are used by the PCIe modules on the
Renesas R-Car V4H (R8A779G0) SoC.  Note that the following descriptions
in the hardware manual Rev.0.81 about the PCIe module clocks are
incorrect:

    9.2.1.7 Software Reset Register 6 (SRCR6)
    9.2.1.12 Software Reset Register 11 (SRCR11)
    9.2.3.7 Module Stop Control Register 6 (MSTPCR6)

Please refer to Figures 104.3[ab] instead.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231114122252.2266799-1-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>