mwifiex: handle start AP error paths correctly

mwifiex: handle start AP error paths correctly

BugLink: https://launchpad.net/bugs/1528910
It's been observed that even if firmware returns an error
for a configuration command, we go ahead and start AP.

This patch changes the command type from async to sync
so that threads waits for command response and return
failure start AP.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
(cherry picked from commit d2b0c735ebac0f0d9746305b40806693d3092f57)
Signed-off-by: Wen-chien Jesse Sung <jesse.sung@canonical.com>
Reviewed-By: AceLan Kao <acelan.kao@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>