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: Ie228900250f1a4965d622c5f85fd86afb8360585
Test: mmma external/e2fsprogs; mmma system/update_engine

(cherry picked from commit 62296a90db05af4abab0031b60287bafcb1db0ff)