boards: arc: remove unused <soc.h>

Header was not used, so remove it. Add other necessary includes as part
of the removal.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

boards/arc/em_starterkit/arc_mpu_regions.c

@@ -5,7 +5,6 @@
  */
 
 #include <zephyr/devicetree.h>
-#include <soc.h>
 #include <zephyr/arch/arc/v2/mpu/arc_mpu.h>
 #include <zephyr/linker/linker-defs.h>
 

boards/arc/em_starterkit/pmodmux.c

@@ -4,7 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <soc.h>
 #include <zephyr/init.h>
 
 #define PMODMUX_BASE_ADDR	0xF0000000

boards/arc/emsdp/arc_mpu_regions.c

@@ -5,7 +5,6 @@
  */
 
 #include <zephyr/devicetree.h>
-#include <soc.h>
 #include <zephyr/arch/arc/v2/mpu/arc_mpu.h>
 #include <zephyr/linker/linker-defs.h>
 

boards/arc/hsdk/platform.c

@@ -4,7 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <soc.h>
 #include <zephyr/init.h>
 
 #define HSDK_CREG_GPIO_MUX_REG	0xf0001484

boards/arc/iotdk/arc_mpu_regions.c

@@ -5,7 +5,6 @@
  */
 
 #include <zephyr/devicetree.h>
-#include <soc.h>
 #include <zephyr/arch/arc/v2/mpu/arc_mpu.h>
 #include <zephyr/linker/linker-defs.h>
 

boards/arc/nsim/arc_mpu_regions.c

@@ -5,7 +5,6 @@
  */
 
 #include <zephyr/devicetree.h>
-#include <soc.h>
 #include <zephyr/arch/arc/v2/mpu/arc_mpu.h>
 #include <zephyr/linker/linker-defs.h>
 

boards/arc/nsim/haps_arcv3_init.c

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <soc.h>
+#include <zephyr/devicetree.h>
 #include <zephyr/init.h>
 
 #define ARC_CLN_MST_NOC_0_0_ADDR	292

boards/arc/qemu_arc/arc_mpu_regions.c

@@ -5,7 +5,6 @@
  */
 
 #include <zephyr/devicetree.h>
-#include <soc.h>
 #include <zephyr/arch/arc/v2/mpu/arc_mpu.h>
 #include <zephyr/linker/linker-defs.h>