UPSTREAM: mwifiex: remove AMSDU_AGGR_CTRL command response handler

UPSTREAM: mwifiex: remove AMSDU_AGGR_CTRL command response handler

HostCmd_CMD_AMSDU_AGGR_CTRL is never called with GET action.
So the code in mwifiex_ret_amsdu_aggr_ctrl() becomes redundant.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
BUG=chrome-os-partner:13998
TEST=Build and run autotest suites

Change-Id: I92dff9846c954405a80af275cdfbff50fda6496d
Reviewed-on: https://gerrit.chromium.org/gerrit/33147
Reviewed-by: Gary Morain <gmorain@chromium.org>
Tested-by: Bing Zhao <bzhao@marvell.com>
Commit-Ready: Bing Zhao <bzhao@marvell.com>