pcDuino:  Several fixes so that it still builds after other Cortex-A changes.
Add configuration to use the fixed DRAM mapping for the page pool (if available) instead of remapping dynamically to access L2 page tables and page data.  Also, add logic in address environment creation to initialize the shared data at the beginning of the .bss/.data process memory region.
SAMA5D4-EK: These configurations now use the fixed DRAM mapping for manipulating the page memory pool.
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Add logic to initialize the per-process user heap when each user process is started
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Fixes to clock bias logic.  Remove vestiges of g_tickbias; apply bias instead to g_basetime
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clock_gettime.c:  Fix a cornercase bug in clock_gettime()
Fix some minor issues with the exampls/udp Makefile
MAINOBJ needs to be added to object list in many Makefile
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More updated makefiles
Kconfig choice value needs a prompt
Refresh NTOSD configurations.  Fix some minor bit rot build issues
Rename some functions and reshuffling some paramters
When a privileged thread exits, we have to use the kernel alloctor to free memory; when an unprivileged thread exits, we don't have to do anything... heap memory will be cleaned up when the address environment is torn down
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Fix for UART7 and UART8 on STM32 clock enable from Aton
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