bta: use standard types

Use standard types everywhere.
Use standard style for #if statements:
 - #if (VAR_NAME == TRUE)
 - #if (VAR_NAME1 == TRUE && VAR_NAME2 == TRUE)
Use __func__ instead of __FUNCTION__
Fix some debug statements to use __func__

Change-Id: Ib86de4de9f14529ecaa4f71597260e3b5785360b