Support built-in ramzswap

This change adds a check for the ramzswap device. This is useful
if the kernel includes ramzswap built-in and not as a module.

Change-Id: I39105064c8fdd678ca3d7e332703b6040806f601

prebuilt/common/bin/compcache

@@ -5,8 +5,9 @@
 #
 
 isramzswap="$(find /system/lib/modules/ -name ramzswap.ko 2>/dev/null)"
+isramzswapbuiltin="$(ls -l /dev/block/ramzswap0 2>/dev/null)"
 
-if [ -n "$isramzswap" ] ; then
+if [ -n "$isramzswap$isramzswapbuiltin" ] ; then
     MODULE=ramzswap
     DEV=/dev/block/ramzswap0
 else