Summary
The naming standard at https://cwiki.apache.org/confluence/display/NUTTX/Naming+FAQ requires that all MCU-private functions begin with the name of the architecture, not up_.
This PR addresses function-like macro naming that was missing in previous PRs: up_savestate() and up_restorestate() which must be named arm_savestate() and arm_restorestate().
Impact
There should be no impact of this change (other that one step toward more consistent naming).
Testing
stm32f103-minimum:nsh
cbc931b590