clk: clk-axi-clkgen: make sure to include mod_devicetable.h

The mod_devicetable header is the one to be used for struct
of_device_id.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250519-dev-axi-clkgen-limits-v6-2-bc4b3b61d1d4@analog.com
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: nunojsa

drivers/clk/clk-axi-clkgen.c

@@ -13,6 +13,7 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/err.h>
 
 #define AXI_CLKGEN_V2_REG_RESET		0x40