drivers: arc/designware: remove unused <soc.h>

The <soc.h> header is not required by a few ARC/Designware drivers, so
remove it.

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

drivers/gpio/gpio_dw.c

@@ -15,7 +15,6 @@
 #include "gpio_utils.h"
 
 #include <zephyr/pm/device.h>
-#include <soc.h>
 #include <zephyr/sys/sys_io.h>
 #include <zephyr/init.h>
 #include <zephyr/sys/util.h>

drivers/i2c/i2c_dw.c

@@ -22,7 +22,6 @@
 #include <zephyr/drivers/pinctrl.h>
 #endif
 
-#include <soc.h>
 #include <errno.h>
 #include <zephyr/sys/sys_io.h>
 

drivers/spi/spi_dw.c

@@ -30,7 +30,6 @@ LOG_MODULE_REGISTER(spi_dw);
 #include <zephyr/kernel.h>
 #include <zephyr/arch/cpu.h>
 
-#include <soc.h>
 #include <zephyr/device.h>
 #include <zephyr/init.h>
 #include <zephyr/pm/device.h>

drivers/timer/arcv2_timer0.c

@@ -9,7 +9,6 @@
 #include <zephyr/sys_clock.h>
 #include <zephyr/spinlock.h>
 #include <zephyr/arch/arc/v2/aux_regs.h>
-#include <soc.h>
 /*
  * note: This implementation assumes Timer0 is present. Be sure
  * to build the ARC CPU with Timer0.