drivers: gicv3: add zephyr kernel header file

zephyr kernel header file should be included otherwise gcc will report
the warning: implicit declaration of function 'k_aligned_alloc' and
the return value of 'k_aligned_alloc' will be treated as an int type,
which will cause an error on the 64 bits platform.

Signed-off-by: Huifeng Zhang <Huifeng.Zhang@arm.com>

drivers/interrupt_controller/intc_gicv3.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/kernel.h>
 #include <zephyr/arch/cpu.h>
 #include <zephyr/sys/__assert.h>
 #include <zephyr/sw_isr_table.h>