Definitions for ARMv7-M AIRCR register, Fixes for ADS7843 and SSD1289 driver,...

Definitions for ARMv7-M AIRCR register, Fixes for ADS7843 and SSD1289 driver, Missing build logic for examples/watchdog

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5198 42af7a65-404d-4744-a932-0658087f49c3