clk: renesas: r8a779h0: Initial clock descriptions should be __initconst

r8a779h0_core_clks[], r8a779h0_mod_clks[], and cpg_pll_configs[] are
only used during initialization.  Hence make them __initconst, so they
will be freed later.

Fixes: f077cab3 ("clk: renesas: cpg-mssr: Add support for R-Car V4M")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/35bbcfb914ddb377fa77e3425e4e7e232c7c2cf9.1720794214.git.geert+renesas@glider.be