android: persistent_ram: move persistent_ram.h back to include/linux

When persistent_ram went in to staging, persistent_ram.h was moved
from include/linux to driver/staging/android.  To avoid having to
fix all the users, move it back to include/linux.

Change-Id: Ifa73781b4af5412042114a4b9b0476f6c4abb99e
Signed-off-by: Colin Cross <ccross@android.com>

drivers/staging/android/persistent_ram.c

@@ -20,10 +20,10 @@
 #include <linux/io.h>
 #include <linux/list.h>
 #include <linux/memblock.h>
+#include <linux/persistent_ram.h>
 #include <linux/rslib.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
-#include "persistent_ram.h"
 
 struct persistent_ram_buffer {
 	uint32_t    sig;

drivers/staging/android/ram_console.c

@@ -16,12 +16,12 @@
 #include <linux/console.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/persistent_ram.h>
 #include <linux/platform_device.h>
 #include <linux/proc_fs.h>
 #include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
-#include "persistent_ram.h"
 #include "ram_console.h"
 
 static struct persistent_ram_zone *ram_console_zone;