Remove unused libcrypto dependency.

libcrypto is unused, which causes problems when boringssl hash
injection is turned on as the code is all stripped and there is
nothing left to inject the hash into.

Bug: 137267623
Test: Ran the following together with the changes from
      http://r.android.com/q/topic:bug137267623_bsslselftest

      m VtsHalDrmV1_{0,1,2}TargetTest \
        VtsHalWifiHostapdV1_{0,1}TargetTest{,Util} \
        VtsHalWifiSupplicantV1_{0,1,2}TargetTest{,Util} \
        VtsHalWifiSupplicantP2pV1_{0,2}TargetTest

      (croot hardware/interfaces/confirmationui ; mma)
      (croot hardware/interfaces/drm ; mma)
      (croot hardware/interfaces/keymaster ; mma)

Change-Id: Ib0607671ef71d99becb483774f810aad9762f4f1