keystore2: km_compat: Strip prefix for importWrappedKey.

Also fix a bug in deleteKey() where the prefixed blob was passed to
the soft KeyMint implementation.

Bug: 181931306
Test: atest android.keystore.cts.ImportWrappedKeyTest#testKeyStore_ImportWrappedKey
Change-Id: I785f7b08eb889c5ce91d379197e3f00f93224a44
1 file changed