dt-bindings: clock: r8a7795: Remove CSIREF clock

The R-Car Gen3 HardWare Manual Errata for Rev. 0.52 (Nov 30, 2016)
removed the CSI reference clock on R-Car H3.

As this definition was never used, it can just be removed.
The freed slot in the DT bindings header must not be reused, though.

Fixes: 9d0c3c68 ("clk: shmobile: Add r8a7795 CPG Core Clock Definitions")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Stephen Boyd <sboyd@kernel.org>

include/dt-bindings/clock/r8a7795-cpg-mssr.h

@@ -50,7 +50,7 @@
 #define R8A7795_CLK_CANFD		39
 #define R8A7795_CLK_HDMI		40
 #define R8A7795_CLK_CSI0		41
-#define R8A7795_CLK_CSIREF		42
+/* CLK_CSIREF was removed */
 #define R8A7795_CLK_CP			43
 #define R8A7795_CLK_CPEX		44
 #define R8A7795_CLK_R			45