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: 9d0c3c682033d3f1 ("clk: shmobile: Add r8a7795 CPG Core Clock Definitions")
Signed-off-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Stephen Boyd <[e-mail]>

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

···
 #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