clk: imx8mn: Add GIC clock

This is enabled by default but if it's not explicitly defined and marked
as critical then its parent might get turned off.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

include/dt-bindings/clock/imx8mn-clock.h

@@ -209,7 +209,8 @@
 #define IMX8MN_CLK_ARM				191
 #define IMX8MN_CLK_NAND_USDHC_BUS_RAWNAND_CLK	192
 #define IMX8MN_CLK_GPU_CORE_ROOT		193
+#define IMX8MN_CLK_GIC				194
 
-#define IMX8MN_CLK_END				194
+#define IMX8MN_CLK_END				195
 
 #endif