Flip the overlay logic.

The default dts will be 2GB memory configuration, and if EVT1 is
detected, the EVT1 config will be applied. This also helps with the dts
overlay failure case as the default would support EVT2+ memory config
moving forward.

Tested: Flash and boot both EVT1 and EVT2 boards. Chech the memory

Change-Id: Ib9a400390b19f6cd6c3ce73282386c726ffe8b3d
1 file changed
tree: cf09ce097349aaadfe8b1e0e3a95b1854f3c02be
  1. debian/
  2. mt8167-coral/
  3. usr/
  4. boot.txt
  5. overlays.txt
  6. ubootenv.py