ARM: dts: r7s72100: add USB bit definitions

Add the bit locations that correspond to the USB clocks.
Signed-off-by: NChris Brandt <chris.brandt@renesas.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

include/dt-bindings/clock/r7s72100-clock.h

@@ -34,6 +34,8 @@
 
 /* MSTP7 */
 #define R7S72100_CLK_ETHER	4
+#define R7S72100_CLK_USB0	1
+#define R7S72100_CLK_USB1	0
 
 /* MSTP8 */
 #define R7S72100_CLK_MMCIF	4