cleanup: include/: move gpio.h to drivers/gpio.h

move gpio.h to drivers/gpio.h and
create a shim for backward-compatibility.

No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.

Related to #16539

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

drivers/display/display_ili9340.c

@@ -12,7 +12,7 @@
 #include <logging/log.h>
 LOG_MODULE_REGISTER(display_ili9340);
 
-#include <gpio.h>
+#include <drivers/gpio.h>
 #include <misc/byteorder.h>
 #include <spi.h>
 #include <string.h>

drivers/display/mb_display.c

@@ -13,7 +13,7 @@
 
 #include <zephyr.h>
 #include <init.h>
-#include <gpio.h>
+#include <drivers/gpio.h>
 #include <device.h>
 #include <string.h>
 #include <misc/printk.h>

drivers/display/ssd1306.c

@@ -11,7 +11,7 @@ LOG_MODULE_REGISTER(ssd1306);
 #include <string.h>
 #include <device.h>
 #include <init.h>
-#include <gpio.h>
+#include <drivers/gpio.h>
 #include <i2c.h>
 
 #include "ssd1306_regs.h"

drivers/display/ssd1673.c

@@ -12,7 +12,7 @@ LOG_MODULE_REGISTER(ssd1673);
 #include <device.h>
 #include <display.h>
 #include <init.h>
-#include <gpio.h>
+#include <drivers/gpio.h>
 #include <spi.h>
 #include <misc/byteorder.h>