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)

platforms/posix/cmake/px4_impl_os.cmake

@@ -223,10 +223,7 @@ function(px4_os_add_flags)
 	if ("${PX4_BOARD}" MATCHES "sitl")
 
 		if(UNIX AND APPLE)
-			add_definitions(
-				-D__PX4_DARWIN
-				-D__DF_DARWIN
-				)
+			add_definitions(-D__PX4_DARWIN)
 
 			if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
 				message(FATAL_ERROR "PX4 Firmware requires XCode 8 or newer on Mac OS. Version installed on this system: ${CMAKE_CXX_COMPILER_VERSION}")
@@ -251,46 +248,21 @@ function(px4_os_add_flags)
 				-U__CUSTOM_FILE_IO__
 				)
 		else()
-			add_definitions(
-				-D__PX4_LINUX
-				-D__DF_LINUX
-				)
+			add_definitions(-D__PX4_LINUX)
 		endif()
 
 	elseif (("${PX4_BOARD}" MATCHES "navio2") OR ("${PX4_BOARD}" MATCHES "raspberrypi"))
-
 		#TODO: move to board support
-
-		add_definitions(
-			-D__PX4_LINUX
-
-			# For DriverFramework
-			-D__DF_LINUX
-			-D__DF_RPI
-		)
+		add_definitions(-D__PX4_LINUX)
 
 	elseif ("${PX4_BOARD}" MATCHES "aerotenna_ocpoc")
-
 		#TODO: move to board support
-
-		add_definitions(
-			-D__PX4_LINUX
-			-D__PX4_POSIX_OCPOC # TODO: remove
-
-			# For DriverFramework
-			-D__DF_LINUX
-			-D__DF_OCPOC
-		)
+		add_definitions(-D__PX4_LINUX)
 
 	elseif ("${PX4_BOARD}" MATCHES "beaglebone_blue")
 		#TODO: move to board support
 		add_definitions(
 			-D__PX4_LINUX
-			-D__PX4_POSIX_BBBLUE # TODO: remove
-
-			# For DriverFramework
-			-D__DF_LINUX
-			-D__DF_BBBLUE
 
 			-DRC_AUTOPILOT_EXT  # Enable extensions in Robotics Cape Library, TODO: remove
 		)