KM default implementations: Add vendor and boot patchlevels.

Default (software) implementations need to return vendor and boot patch
levels. This CL sets this information. Since software implementations
have no means of getting information from the bootloader, the os
patchlevel is used in its place.

Bug: 189973657
Test: keystore2_km_compat_test
Change-Id: I4f60caabf6459ecd9bdc15ed3aabd9f91a04b197
2 files changed