ANDROID: GKI: add padding to struct hid_device

struct hid_device was not being tracked as a "stable" symbol in the
past, but that looks to change with some future abi requirements.  So
add needed padding now, to ensure that we can support this over the
long-term.

This does not change the existing api at all as this symbol was not
supported yet.

Bug: 151154716
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I8c3064fb7a19006a29dabbaf25c9ed1737f62e75

include/linux/hid.h

@@ -26,6 +26,7 @@
 #include <linux/mutex.h>
 #include <linux/power_supply.h>
 #include <uapi/linux/hid.h>
+#include <linux/android_kabi.h>
 
 /*
  * We parse each description item into this structure. Short items data
@@ -629,6 +630,9 @@ struct hid_device {							/* device report descriptor */
 	struct list_head debug_list;
 	spinlock_t  debug_list_lock;
 	wait_queue_head_t debug_wait;
+
+	ANDROID_KABI_RESERVE(1);
+	ANDROID_KABI_RESERVE(2);
 };
 
 #define to_hid_device(pdev) \