ax88179_178a: Correct the RX error definition in RX header

Correct the definition of AX_RXHDR_CRC_ERR and
AX_RXHDR_DROP_ERR. They are BIT29 and BIT31 in pkt_hdr
seperately.

Change-Id: I3d3b29874a94ab4ba6c94ee7d40d2b75afbd0027
Signed-off-by: Freddy Xin <freddy@asix.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
Git-commit: 7e78b83cb95dd2c3a6c829c5d861d515c1d817a5
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[ilialin@codeaurora.org: Backported to the msm-3.10]
Signed-off-by: Ilia Lin <ilialin@codeaurora.org>