include: add missing zephyr/kernel.h

Some files were using the Kernel APIs/types without including
zephyr/kernel.h.

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

drivers/flash/soc_flash_cc13xx_cc26xx.c

@@ -6,6 +6,7 @@
 
 #include <zephyr/device.h>
 #include <zephyr/drivers/flash.h>
+#include <zephyr/kernel.h>
 #include <string.h>
 
 #include <driverlib/flash.h>

drivers/i2s/i2s_litex.c

@@ -6,6 +6,7 @@
 
 #include <string.h>
 #include <zephyr/drivers/i2s.h>
+#include <zephyr/kernel.h>
 #include <zephyr/sys/byteorder.h>
 #include <soc.h>
 #include <zephyr/sys/util.h>

drivers/i2s/i2s_litex.h

@@ -10,6 +10,7 @@
 #include <zephyr/device.h>
 #include <zephyr/drivers/i2s.h>
 #include <zephyr/devicetree.h>
+#include <zephyr/kernel.h>
 
 /* i2s configuration mask*/
 #define I2S_CONF_FORMAT_OFFSET 0

drivers/memc/memc_stm32_sdram.c

@@ -7,6 +7,7 @@
 #define DT_DRV_COMPAT st_stm32_fmc_sdram
 
 #include <zephyr/device.h>
+#include <zephyr/kernel.h>
 #include <soc.h>
 
 #include <zephyr/logging/log.h>

drivers/peci/peci_npcx.c

@@ -12,6 +12,7 @@
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/drivers/peci.h>
 #include <zephyr/drivers/pinctrl.h>
+#include <zephyr/kernel.h>
 
 #include <zephyr/logging/log.h>
 #include <zephyr/irq.h>

drivers/serial/uart_smartbond.c

@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <zephyr/drivers/uart.h>
 #include <zephyr/drivers/pinctrl.h>
+#include <zephyr/kernel.h>
 #include <zephyr/spinlock.h>
 #include <zephyr/sys/byteorder.h>
 #include <DA1469xAB.h>