clk: mmp: add timer clock for pxa168/mmp2/pxa910

Timer has external fast clock, and it is a mux clock.
Add the timer clock type for timer driver.

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/include/dt-bindings/clock/marvell,mmp2.h b/include/dt-bindings/clock/marvell,mmp2.h
index 591f7fb..7a51038 100644
--- a/include/dt-bindings/clock/marvell,mmp2.h
+++ b/include/dt-bindings/clock/marvell,mmp2.h
@@ -48,6 +48,7 @@
 #define MMP2_CLK_SSP1			78
 #define MMP2_CLK_SSP2			79
 #define MMP2_CLK_SSP3			80
+#define MMP2_CLK_TIMER			81
 
 /* axi periphrals */
 #define MMP2_CLK_SDH0			101