multirom: uninstaller: Support symlinked init and init.real

 * Allows the usage of symlinks on /init for ramdisk
    using this method to call the real binary or script

 * Detect the init.real file from the primary ramdisk
    and use it instead of the /init (init_sony for example)

Change-Id: I1199e00679f0822433773cd2a374c29074d9685f
Signed-off-by: Adrian DC <radian.dc@gmail.com>

Author: AdrianDC

install_zip/prebuilt-uninstaller/scripts/clear_boot.sh

@@ -39,15 +39,20 @@ case "$magic" in
         ;;
 esac
 
-if [ rd_cmpr == -1 ] || [ ! -f /tmp/boot/init ] ; then
+if [ rd_cmpr == -1 ] || [ ! -e /tmp/boot/init -a ! -L /tmp/boot/init ] ; then
     echo "Failed to extract ramdisk!"
     return 1
 fi
 
 # restore init
 if [ -e /tmp/boot/main_init ] ; then
-    rm /tmp/boot/init
-    mv /tmp/boot/main_init /tmp/boot/init
+    if [ -e /tmp/boot/init.real ] ; then
+        rm /tmp/boot/init.real
+        mv /tmp/boot/main_init /tmp/boot/init.real
+    else
+        rm /tmp/boot/init
+        mv /tmp/boot/main_init /tmp/boot/init
+    fi
 fi
 
 chmod 750 /tmp/boot/init