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)

src/drivers/linux_pwm_out/bbblue_pwm_rc.cpp

@@ -30,7 +30,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *
  ****************************************************************************/
-#ifdef __PX4_POSIX_BBBLUE
+#ifdef CONFIG_ARCH_BOARD_BEAGLEBONE_BLUE
 
 #include <fcntl.h>
 #include <errno.h>
@@ -79,4 +79,4 @@ int BBBlueRcPWMOut::send_output_pwm(const uint16_t *pwm, int num_outputs)
 	return ret;
 }
 
-#endif  // __PX4_POSIX_BBBLUE
+#endif  // CONFIG_ARCH_BOARD_BEAGLEBONE_BLUE

src/drivers/linux_pwm_out/linux_pwm_out.cpp

@@ -235,7 +235,7 @@ void task_main(int argc, char *argv[])
 		PX4_INFO("Starting PWM output in ocpoc_mmap mode");
 		pwm_out = new OcpocMmapPWMOut(_max_num_outputs);
 
-#ifdef __DF_BBBLUE
+#ifdef CONFIG_ARCH_BOARD_BEAGLEBONE_BLUE
 
 	} else if (strcmp(_protocol, "bbblue_rc") == 0) {
 		PX4_INFO("Starting PWM output in bbblue_rc mode");