axolotl: defconfig: create configs per build variant

Copy sdm845_defconfig for eng and userdebug.
Copy sdm845-perf_defconfig for user.

Change-Id: I2e8bd1393e23debb33015da0769142dc4422eefa
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
3 files changed