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/nuttx/src/px4/common/CMakeLists.txt

@@ -40,7 +40,7 @@ if (NOT ${PX4_BOARD} MATCHES "px4_io")
 		board_fat_dma_alloc.c
 		console_buffer.cpp
 		gpio.c
-		px4_nuttx_tasks.c
+		tasks.cpp
 		px4_nuttx_impl.cpp
 		px4_init.cpp
 	)

platforms/nuttx/src/px4/common/include/px4_platform/micro_hal.h

@@ -34,7 +34,6 @@
 
 
 __BEGIN_DECLS
-#include <nuttx/spi/spi.h>
 
 /* For historical reasons (NuttX STM32 numbering) PX4 bus numbering is 1 based
  * All PX4 code, including, board code is written to assuming 1 based numbering.

platforms/nuttx/src/px4/common/tasks.cpp

@@ -33,11 +33,13 @@
  ****************************************************************************/
 
 /**
- * @file px4_nuttx_tasks.c
+ * @file tasks.cpp
  * Implementation of existing task API for NuttX
  */
 
-#include <nuttx/config.h>
+#include <px4_platform_common/px4_config.h>
+#include <px4_platform_common/log.h>
+#include <px4_platform_common/tasks.h>
 
 #include <sys/wait.h>
 #include <stdbool.h>
@@ -50,10 +52,6 @@
 #include <errno.h>
 #include <stdbool.h>
 
-#include <px4_platform_common/px4_config.h>
-#include <px4_platform_common/log.h>
-#include <px4_platform_common/tasks.h>
-
 void
 px4_systemreset(bool to_bootloader)
 {