vold2: Refactor the netlink event handling and better define how partitions/disks are handled

Signed-off-by: San Mehat <san@android.com>
diff --git a/Volume.cpp b/Volume.cpp
index aaccb2b..52d02cf 100644
--- a/Volume.cpp
+++ b/Volume.cpp
@@ -35,7 +35,7 @@
     free(mMountpoint);
 }
 
-int Volume::handleDiskInsertion(const char *dp, int maj, int min, int nr_parts) {
+int Volume::handleBlockEvent(NetlinkEvent *evt) {
     errno = ENOSYS;
     return -1;
 }