DriverFramework purge

The bulk of this change was tightly coupled and needed to be deleted in one pass. Some of the smaller changes were things that broke as a result of the initial purge and subsequently fixed by further eradicating unnecessary platform differences. Finally, I deleted any dead code I came across in the related files I touched while going through everything.

 - DriverFramework (src/lib/DriverFramework submodule) completely removed
 - added dspal submodule in qurt platform (was brought in via DriverFramework)
 - all df wrapper drivers removed
 - all boards using df wrapper drivers updated to use in tree equivalents
 - unused empty arch/board.h on posix and qurt removed
 - unused IOCTLs removed (pub block, priv, etc)
 - Integrator delete methods only used from df wrapper drivers
 - commander: sensor calibration use "NuttX version" everywhere for now
 - sensors: update to px4_{open, read, close} instead of DevMgr wrapper (adc open for analog differential pressure)
 - battery_status: update to px4_{open, read, close} instead of DevMgr wrapper (adc open for analog differential pressure)
 - cdev cleanup conflicting typedefs and names with actual OS (pollevent_t, etc)
 - load_mon and top remove from linux boards (unused)
 - delete unused PX4_MAIN_FUNCTION
 - delete unused getreg32 macro
 - delete unused SIOCDEVPRIVATE define
 - named each platform tasks consistently
 - posix list_devices and list_topics removed (list_files now shows all virtual files)

boards/beaglebone/blue/src/init.cpp

@@ -49,7 +49,6 @@ int rc_init(void)
 #ifdef __RC_V0_3
 	return rc_initialize();
 #else
-#ifdef __DF_BBBLUE
 
 	if (rc_get_state() == RUNNING) {  return 0; }
 
@@ -111,7 +110,6 @@ int rc_init(void)
 	//i2c, barometer and mpu will be initialized later
 
 	rc_set_state(RUNNING);
-#endif
 
 	return 0;
 #endif
@@ -123,7 +121,6 @@ void rc_cleaning(void)
 #ifdef __RC_V0_3
 	rc_cleanup();  return ;
 #else
-#ifdef __DF_BBBLUE
 
 	if (rc_get_state() == EXITING) { return; }
 
@@ -136,5 +133,4 @@ void rc_cleaning(void)
 
 	rc_remove_pid_file();
 #endif
-#endif
 }