Remove (now) unused android_bcpkix source

The android_bcpkix code was used in CTS tests but the reference
was changed to use the unbundled/non-platform version in
commit de8b086. The target/srcgen can now be removed.

Bug: 113148576
Test: build
Change-Id: I2c22a67e2f8ad78b27ce07d8ed8f0d03b55216f1
98 files changed