ARM: dts: r8a7792: Correct Z clock

Unlike other R-Car Gen2 SoCs with Cortex-A15 CPU cores, R-Car V2H does
not have a programmable Z clock (Cortex-A15 CPU core clock), but uses a
fixed divider.
This is similar to the Z2 clock (Cortex-A7 CPU core clock) on R-Car E2.

Hence:
  - Remove the Z clock output from the cpg_clocks node, as this implied
    a programmable clock,
  - Add the Z clock as a fixed factor clock,
  - Let the first CPU node point to the new Z clock,
  - Remove the Z clock index from the bindings (this definition was used
    by r8a7792.dtsi only, and was not a contract between DT and driver).

Fixes: 7c4163aae3 ("ARM: dts: r8a7792: initial SoC device tree")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

include/dt-bindings/clock/r8a7792-clock.h

@@ -17,7 +17,6 @@
 #define R8A7792_CLK_PLL3		3
 #define R8A7792_CLK_LB			4
 #define R8A7792_CLK_QSPI		5
-#define R8A7792_CLK_Z			6
 
 /* MSTP0 */
 #define R8A7792_CLK_MSIOF0		0