KeyMint: CreateKeyMintDevice retruns shared_ptr. am: 99e4a381a1 am: 05d5e5fea0 am: 265c6e55a3

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/2005013

Change-Id: I65ff803264287034f6e06814014cc89a0aa13f5a