Fix 22135 - Fix env validation for mega 1280#22150

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thinkyhead merged 2 commits intoMarlinFirmware:bugfix-2.0.xfrom

rhapsodyv:fix-22135-mega-1280-validation

Jun 17, 2021

Commits on Jun 16, 2021

fix ALLOW_MEGA1280 if
rhapsodyv
committed

Commits on Jun 17, 2021

rearrange
thinkyhead
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