MAINTAINERS: Add DT Bindings for Renesas Clock Generators

The "RENESAS CLOCK DRIVERS" section lacks the related DT bindings.
Add them.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

MAINTAINERS

···
 L:	[e-mail]
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git clk-renesas
+F:	Documentation/devicetree/bindings/clock/renesas,*
 F:	drivers/clk/renesas/
 
 RENESAS EMEV2 I2C DRIVER