clk: imx6sl: add mmdc ipg clocks

i.MX6SL has MMDC0 and MMDC1 ipg clock in CCM CCGR, add them into
clock tree for clock management.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
diff --git a/include/dt-bindings/clock/imx6sl-clock.h b/include/dt-bindings/clock/imx6sl-clock.h
index e14573e..cfbfc39 100644
--- a/include/dt-bindings/clock/imx6sl-clock.h
+++ b/include/dt-bindings/clock/imx6sl-clock.h
@@ -175,6 +175,8 @@
 #define IMX6SL_CLK_SSI2_IPG		162
 #define IMX6SL_CLK_SSI3_IPG		163
 #define IMX6SL_CLK_SPDIF_GCLK		164
-#define IMX6SL_CLK_END			165
+#define IMX6SL_CLK_MMDC_P0_IPG		165
+#define IMX6SL_CLK_MMDC_P1_IPG		166
+#define IMX6SL_CLK_END			167
 
 #endif /* __DT_BINDINGS_CLOCK_IMX6SL_H */