Keystore 2.0: Enable by default.

Keystore 2.0 is to replace Keystore. This patch removes
checking the keystore2 enable property and installs the Keystore 2.0 SPI
by default.

cherry-pick from commit 7aa8d2aae2dec664452ddef7454dc58441031959

Bug: 171563717
Test: N/A
Merged-In: I13a3db8ca736cceb06e864457046ff9ca641322d
Change-Id: I13a3db8ca736cceb06e864457046ff9ca641322d
2 files changed