Revert "gpio: include <linux/io-mapping.h> in gpiolib-of"

This reverts commit 7d4defe.

The commit was pointless, manically trembling in the dark for
a solution. The real fixes are:

commit 048c28c
("gpio: make any OF dependent driver depend on OF_GPIO")
commit 2527ecc
("gpio: Fix OF build problem on UM")

Reported-by: Chris Wilson <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

Author: linusw

drivers/gpio/gpiolib-of.c

@@ -16,7 +16,6 @@
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/io.h>
-#include <linux/io-mapping.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of.h>
 #include <linux/of_address.h>