jni: Punt to generic JNI for mips

Preopting dex the bootclasspath causes dex2oat to crash for MIPS builds.
Disable JNI compiler for MIPS until it supports @CriticalNative.

Test: lunch aosp_mips-eng && make && make test-art-host
Bug: 31743474
Change-Id: I802f1e61863c4bb54a1bd884a4c9ce9a75bab62b
1 file changed