Summary
The naming standard at https://cwiki.apache.org/confluence/display/NUTTX/Naming+FAQ requires that all MCU-private files begin with the name of the architecture, not up_.
This PR addresses only these name changes for the up_*.h files. There are only three, but almost 1680 files that include them:
up_arch.h
up_internal.h
up_vfork.h
The only change to the files is from including up_arch.h to arm_arch.h (for example).
The entire job required to be compatible with that Naming Convention will also require changing the naming of the up_() functions that are used only within arch/arm and board/arm.
Impact
There should be not impact of this change (other that one step toward more consistent naming).
Testing
stm32f4discovery:netnsh
* boards/arm/stm32/nucleo-f429zi: Initial port to nucleo-f429zi board.
* boards/arm/stm32/nucleo-f429zi: Add two demo configs.
* Add the nucleo-f429zi to boards/Kconfig
boards/Kcondig: Fixed line alignment issue.
* boards/arm/stm32/nucleo-f429zi: Change the license header of all new files to an Apache 2.0 license.
* boards/arm/stm32/nucleo-f429zi: nxstyle fixed
