hikey960: enable the bootcontrol hal for hikey960 build

so that it will be possible to work with the GSI image

Test: boot to homescreen
      console:/ # getprop init.svc.vendor.boot-hal-1-1
      running
      console:/ #
      VtsHalBootV1_0TargetTest and VtsHalBootV1_1TargetTest
      boot with the system image from build#8690703[1]

Note:
    As there is no misc partition with the current prm_ptable file
    using the vendor partition for the /misc mountpoint
    to work around temporarily

[1]: https://ci.android.com/builds/submitted/8690703/aosp_arm64-userdebug/latest

Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
Change-Id: Ie4672328fbdcb33f83f6a4b0995cc1a370cb9efa
3 files changed