treewide: use full path to uart.h header

The build infrastructure should not be adding the drivers subdirectory
to the include path.  Fix the legacy uses that depended on that
addition.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>

drivers/serial/uart_xlnx_ps.c

@@ -29,7 +29,7 @@
 #include <init.h>
 #include <toolchain.h>
 #include <linker/sections.h>
-#include <uart.h>
+#include <drivers/uart.h>
 #include <sys/sys_io.h>
 
 #define XUARTPS_CR_OFFSET	0x0000U  /**< Control Register [8:0] */

samples/net/wpan_serial/src/main.c

@@ -15,7 +15,7 @@
 #include <logging/log.h>
 LOG_MODULE_REGISTER(wpan_serial, CONFIG_USB_DEVICE_LOG_LEVEL);
 
-#include <uart.h>
+#include <drivers/uart.h>
 #include <zephyr.h>
 
 #include <net/buf.h>

soc/arm/nxp_kinetis/k2x/soc.c

@@ -19,7 +19,7 @@
 #include <device.h>
 #include <init.h>
 #include <soc.h>
-#include <uart.h>
+#include <drivers/uart.h>
 #include <fsl_common.h>
 #include <fsl_clock.h>
 #include <arch/cpu.h>

subsys/console/getchar.c

@@ -8,7 +8,7 @@
 #include <device.h>
 #include <console/console.h>
 #include <console/tty.h>
-#include <uart.h>
+#include <drivers/uart.h>
 
 static struct tty_serial console_serial;