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
This files in the arch/arm/src/armv8-m directory were cloned from arch/arm/src/armv7-m. Naming standards were created for the architecture files, function, and variable names: https://cwiki.apache.org/confluence/display/NUTTX/Naming+FAQ
There however were never appliced to arch/arm/src/armv7-m and so this bad naming was inherited by arch/arm/src/armv8-m. This commit corrects the file naming only and makes it compliant with the Naming FAQ.
