Revert "KeyMint HAL: add curve 25519, bump version"

Revert "Bump keystore2 AIDL API version 1->2"

Revert "Advertise support of KeyMint V2"

Revert submission 1900930-version-bump

Reason for revert: Broken build on sc-qpr1-dev-plus-aosp, b/210450339
Reverted Changes:
I42a9b854f:keystore2: cope with new curve25519 enum
I167d568d6:Bump keystore2 AIDL API version 1->2
I3a16d072e:Advertise support of KeyMint V2
Ibf2325329:KeyMint HAL: add curve 25519, bump version

Change-Id: I78d4b07c41aa6bfeb367b56a58deeac6adb6ec46