bt: Wake via proc

Fixes bt restarting

Change-Id: I45e64ee45d4b16201c5a31145b2f50d698a85024
Requires: https://github.com/androidarmv6/android_kernel_lge_msm7x27-3.0.x/commit/7c2268cee30a51a37af4700700a7903285417029