Ext4Pkg: Replace the CRC implementations with BaseLib

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3871



Since the existing CRC16/CRC32c implementations have been/will be
a part of BaseLib, use BaseLib and remove the Crc16.c/Crc32c.c.

Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>

Signed-off-by: Pedro Falcato <pedro.falcato@gmail.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>