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

drivers/clk/renesas/Kconfig

@@ -218,14 +218,14 @@ config CLK_RCAR_GEN4_CPG
 	select CLK_RENESAS_CPG_MSSR
 
 config CLK_RCAR_USB2_CLOCK_SEL
-	bool "Renesas R-Car USB2 clock selector support"
+	bool "R-Car USB2 clock selector support"
 	depends on ARCH_RENESAS || COMPILE_TEST
 	select RESET_CONTROLLER
 	help
 	  This is a driver for R-Car USB2 clock selector
 
 config CLK_RZG2L
-	bool "Renesas RZ/{G2L,G2UL,G3S,V2L} family clock support" if COMPILE_TEST
+	bool "RZ/{G2L,G2UL,G3S,V2L} family clock support" if COMPILE_TEST
 	select RESET_CONTROLLER
 
 # Generic