ARM: dts: qcom: add an empty hab into the baseline vplatform

The empty hab entry has no actual MMID group entries. With it,
hab driver can initialize successfully, but it can not be used
by any clients since no acutal physical channels are created.

Change-Id: Ia5c85cf9c32ae2cb33bd1f36de7ac3e9337dfa2f
Signed-off-by: Yong Ding <yongding@codeaurora.org>