Disable ART APEX for PDK builds

They depend on bouncycastle which is disabled for PDK builds and thus
can't be built. Disable them.

Bug: 157267166
Test: TARGET_BUILD_PDK=true m
(still fails with another reason though:
cts/apps/CtsVerifier/Android.mk: error: CtsVerifier: Specifies both
LOCAL_SDK_VERSION (test_current) and LOCAL_PRIVATE_PLATFORM_APIS (true)
but should specify only one)

Change-Id: I3b9cc031a441c7ad9e1a47cfd0dc3529cbd2358b
1 file changed