clk: renesas: r8a7745: Remove nonexisting scu-src[0789] clocks

RZ/G1E does not have the SCU-SRC[0789] modules and module clocks.

Fixes: 9127d54b ("clk: renesas: cpg-mssr: Add R8A7745 support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>