zephyr: use cmsis_core.h header

CMSIS glue code is now provided by the CMSIS Zephyr module in
<cmsis_core.h>. Header is generic for M/A/R.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/boot/zephyr/arm_cleanup.c b/boot/zephyr/arm_cleanup.c
index d58956f..3b6c71a 100644
--- a/boot/zephyr/arm_cleanup.c
+++ b/boot/zephyr/arm_cleanup.c
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/arch/arm/aarch32/cortex_m/cmsis.h>
 #include <zephyr/toolchain.h>
 
+#include <cmsis_core.h>
 #if CONFIG_CPU_HAS_NXP_MPU
 #include <fsl_sysmpu.h>
 #endif