Revert "Add qemu.hw.mainkeys to system property_contexts"

Revert submission 1582845-qemu-prop

Reason for revert: aosp_hawk-userdebug is broken on an RVC branch
Reverted Changes:
Idfc2bffa5:Add qemu.hw.mainkeys to system property_contexts
If013ff33f:Remove qemu.hw.mainkeys from vendor_qemu_prop
Bug: 180412668
Change-Id: I335afb931eaeb019f66e3feedea80b0c8888f7a3
6 files changed