Reset Bluetooth using hardware pin via dts
Compared with the previously submitted version, the following
information are some specific revision histories
V3-->V4 modifications:
Modify dt binding format information and
the explanation text in the patch
V2-->V3 modifications:
-Changed the capitalization of co-developer names,
using the correct capitalization of abbreviations and full
name, and corrected obvious spelling errors.
-Add a revision history.
-Remove the "BT Driver" in the prefix.
-Add the bt-binding document, include inforamtion related to reset
pin and compatibility matching.
-Add a comment before the schedule_delayed_work function call,
although schedule_delayed_work is asynchronous, there is no risk.
Even if it is not completed within 200ms, it will only postpone
the subsequent probe and will not have any impact.
-Add a comment before the btmtk_reset_by_gpio function call,
if the compatibility filed or pin cannot be found in the dts
files, it can still reset bluetooth using software reset.
V2 modifications:
Modify gpio to GPIO, SW to software,
and fix other obvious spelling errors.