clk: renesas: rz: clk-rz is meant for RZ/A1

The RZ family of Renesas SoCs has several different subfamilies (RZ/A,
RZ/G, RZ/N, and RZ/T).  Clarify that the renesas,rz-cpg-clocks DT
bindings and clk-rz driver apply to RZ/A1 only.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/clock/renesas,rz-cpg-clocks.txt

-* Renesas RZ Clock Pulse Generator (CPG)
+* Renesas RZ/A1 Clock Pulse Generator (CPG)
 
-The CPG generates core clocks for the RZ SoCs. It includes the PLL, variable
+The CPG generates core clocks for the RZ/A1 SoCs. It includes the PLL, variable
 CPU and GPU clocks, and several fixed ratio dividers.
 The CPG also provides a Clock Domain for SoC devices, in combination with the
 CPG Module Stop (MSTP) Clocks.

drivers/clk/renesas/clk-rz.c

 /*
- * rz Core CPG Clocks
+ * RZ/A1 Core CPG Clocks
  *
  * Copyright (C) 2013 Ideas On Board SPRL
  * Copyright (C) 2014 Wolfram Sang, Sang Engineering <wsa@sang-engineering.com>