usb: gadget: aspeed: Rectify a bit a random header inclusion

It looks like the driver copied'n'pasted almost random set of
headers for its code. Rectify it a bit by removing of_gpio.h
that is not only unused, but also will be removed in the future
completely.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230313155310.80022-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/aspeed-vhub/core.c

@@ -21,7 +21,6 @@
 #include <linux/clk.h>
 #include <linux/usb/gadget.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/regmap.h>
 #include <linux/dma-mapping.h>
 

drivers/usb/gadget/udc/aspeed-vhub/dev.c

@@ -21,7 +21,6 @@
 #include <linux/clk.h>
 #include <linux/usb/gadget.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/regmap.h>
 #include <linux/dma-mapping.h>
 #include <linux/usb.h>

drivers/usb/gadget/udc/aspeed-vhub/ep0.c

@@ -21,7 +21,6 @@
 #include <linux/clk.h>
 #include <linux/usb/gadget.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/regmap.h>
 #include <linux/dma-mapping.h>
 

drivers/usb/gadget/udc/aspeed-vhub/epn.c

@@ -21,7 +21,6 @@
 #include <linux/clk.h>
 #include <linux/usb/gadget.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/regmap.h>
 #include <linux/dma-mapping.h>
 

drivers/usb/gadget/udc/aspeed-vhub/hub.c

@@ -21,7 +21,6 @@
 #include <linux/clk.h>
 #include <linux/usb/gadget.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/regmap.h>
 #include <linux/dma-mapping.h>
 #include <linux/bcd.h>