u2: bluetooth: set bluetooth reset gpio to low by default

Setting the BT_NRST to high causes suspend issues.

Change-Id: I3498aeab6da3cf30bea15262c109bbb51358464c
u2: mux: setup pin mux for bluetooth

Change-Id: I7119fc4be78bbfd2c0befdc550f2db37712b9381
mach-lge: enable serial devices before platform devices

This will preserve the resume order by enabling the serial device
first followed by the platform device during resume.

Change-Id: Id6f13db1a752f6fc1f30d7444cdac1b31ef42732