clk: renesas: r8a779f0: Add Z0 and Z1 clock support

Add support for the Z0 and Z1 (Cortex-A55 Sub-System 0 (CPU 0-3) and
Sub-System 1 (CPU 4-7)) clocks on R-Car S4-8, based on the existing
support for Z clocks on R-Car Gen4.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/43009e25be1223a717e00c392cb2d416f5d47032.1654695893.git.geert+renesas@glider.be