ARM: dts: msm: Fix a typo in deleting a node in SM8150 v2 DTSI

The label for the opp-tables are being deleted but not the
phandles for the nodes. Fix this bug for the updated tables
to reflect in SM8150 v2.

Change-Id: I1012e2223d28549a528bc16e69b3e3770a03c17e
Signed-off-by: Rama Aparna Mallavarapu <aparnam@codeaurora.org>