Sync libext2fs sources in Android.mk with Makefile.in

Sync libext2fs sources in Android.mk with Makefile.in

The Makefile.in lists all the objects included in the libext2fs library
by default and includes some additional objects based on the configure
time flags. This patch syncs the list of source files in Android.mk
with the list of object files in Makefile.in with the addition of
dumpfs.c (included when configured with --enable-resizer) and leaving
out crc32c.c since it relies on generated tables that depend on the
endianness of the target.

Bug: 23084776
Change-Id: If2cce9749932eae6ec63a6ae5565255b00f9611d
Test: mmma external/e2fsprogs; mmma system/update_engine