clk: renesas: Drop "Renesas" from individual driver descriptions

All configuration options are under the big "Renesas SoC clock support"
umbrella, so there is no reason to repeat this for each driver.
Hence drop "Renesas" from the few that do.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/185323de4d38b9b599775c1b64ce4171551b98d5.1718177124.git.geert+renesas@glider.be