ath10k: Enable wlan firmware based on the driver mode

The firmware is always enabled in the mission mode,
even if the driver is in the utf mode. This causes
unexpected behaviour when driver is in utf mode.

Enable the firmware in FTM mode if the driver is
started in UTF mode, else enable the firmware in
the normal mission mode.

Change-Id: I4da204b6d19d41e208465a8314bfb8cacc346f4b
Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>