mwifiex: use world for unidentified region code

mwifiex: use world for unidentified region code

BugLink: https://launchpad.net/bugs/1528910
It's better to use world if region code from EEPROM is
unidentied instead of forcing it to FCC

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
(cherry picked from commit 19b0a71017aa6d14a32541b8917f1ddf00bad0cd)
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>