Fix attestation properties reading logic

Fixed the logic of reading attestation specific properties in
Build.java.

Bug: 110779648
Test: atest CtsKeystoreTestCases:android.keystore.cts.KeyAttestationTest CtsKeystoreTestCases:DeviceOwnerKeyManagementTest
(cherry picked from https://android-review.googlesource.com/q/commit:316e3d16c9f34212f3beace7695289651d15a071)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:4edeaffcbb9d39efaf49d3e24a621110c367c560)
Merged-In: I9af7daa08cbd8bb52f3509fe93f787ba94b7bbc3
Change-Id: I9af7daa08cbd8bb52f3509fe93f787ba94b7bbc3
1 file changed