dt-bindings: marvell,pxa168: add clock id for SDH3

There are four SDHC peripherals on the PXA168, but only three of them
were present in the DT bindings. This commit adds the fourth.

Signed-off-by: Doug Brown <doug@schmorgal.com>
Link: https://lore.kernel.org/r/20220612192937.162952-10-doug@schmorgal.com
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: dougg3

include/dt-bindings/clock/marvell,pxa168.h

@@ -59,6 +59,7 @@
 #define PXA168_CLK_CCIC0		107
 #define PXA168_CLK_CCIC0_PHY		108
 #define PXA168_CLK_CCIC0_SPHY		109
+#define PXA168_CLK_SDH3			110
 
 #define PXA168_NR_CLKS			200
 #endif