dt-bindings: clock: gxbb-aoclk: Add CEC 32k clock

This patchadds the clock binding entry for the CEC 32K AO Clock.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

include/dt-bindings/clock/gxbb-aoclkc.h

@@ -62,5 +62,6 @@
 #define CLKID_AO_UART1		3
 #define CLKID_AO_UART2		4
 #define CLKID_AO_IR_BLASTER	5
+#define CLKID_AO_CEC_32K	6
 
 #endif