Remove @CorePlatformApi usage from the ojluni/ AlgorithmId.java sources

It's likely a bug in metalava and causes the annotation removed from the
current.txt when merging the annotation from the *.annotated.java files.
The annotations are consistent with other APIs in ojluni/.

Bug: 157639992
Test: m droid
Change-Id: I9b3f4c1153a9b97afaea651ac083dab9a4b63bde
2 files changed