wil6210: update Rx descriptor fields

Rx descriptor fields accordingly to the updated
hardware documentation

Change-Id: I279b04bcd5245713117222b3b524b5faa4a1e456
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 48c963af7432f974348d9a006914dbaf5e7c7140
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-testing.git


Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>