[WCNCR00147425] misc: Fix blocking problem when creating wlan if

[Description]
Fix wlan interface not been created due to request_firmware fallback
blocking when file does not exist. For example, if MT_TxPwrLimit.dat
is not present, it will cause request_firmware fallback to user helper
and block for 60 seconds.

Feature: misc
Change-Id: I3d6e00e28c974228417e47cf9bf05336f802eab5
Signed-off-by: Sarick Jiang <sarick.jiang@mediatek.com>
CR-Id: WCNCR00147425
3 files changed