dt-bindings: clock: thead,th1520-clk-ap: Add ID for C910 bus clock

Add binding ID for C910 bus clock, which takes CLK_C910 as parent and is
essential for C910 cluster's operation.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Yao Zi <ziyao@disroot.org>
Signed-off-by: Drew Fustini <fustini@kernel.org>

include/dt-bindings/clock/thead,th1520-clk-ap.h

@@ -93,6 +93,7 @@
 #define CLK_SRAM3		83
 #define CLK_PLL_GMAC_100M	84
 #define CLK_UART_SCLK		85
+#define CLK_C910_BUS		86
 
 /* VO clocks */
 #define CLK_AXI4_VO_ACLK		0