dt-bindings: marvell,mmp2: Add clock id for the I2S clocks

There are two of these on a MMP2.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lkml.kernel.org/r/20200519224151.2074597-4-lkundrak@v3.skSigned-off-by: Stephen Boyd <sboyd@kernel.org>

include/dt-bindings/clock/marvell,mmp2.h

@@ -29,6 +29,8 @@
 #define MMP3_CLK_PLL1_P			28
 #define MMP3_CLK_PLL2_P			29
 #define MMP3_CLK_PLL3			30
+#define MMP2_CLK_I2S0			31
+#define MMP2_CLK_I2S1			32
 
 /* apb periphrals */
 #define MMP2_CLK_TWSI0			60