wil6210: remove unused rx_reorder members

Remove unused members from struct wil_tid_ampdu_rx

Change-Id: I193d6d610ce615bd114d5a8356fa8c182c747f8a
Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Git-commit: 37f8d26d8347f659e4677b4e438708ce492262bf
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git