dt-bindings: clock: lan966x: Extend includes with clock gates

On lan966x it is allow to control the clock to some peripherals like
USB. So extend the include file with these clocks.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20211103085102.1656081-4-horatiu.vultur@microchip.com

include/dt-bindings/clock/microchip,lan966x.h

@@ -23,6 +23,12 @@
 #define GCK_ID_TIMER		12
 #define GCK_ID_USB_REFCLK	13
 
-#define N_CLOCKS		14
+/* Gate clocks */
+#define GCK_GATE_UHPHS		14
+#define GCK_GATE_UDPHS		15
+#define GCK_GATE_MCRAMC		16
+#define GCK_GATE_HMATRIX	17
+
+#define N_CLOCKS		18
 
 #endif