msm: board-8916: Add a dedicated DT_MACHINE for tellurium

Add a new DT_MACHINE for msmtellurium in board-8916 to share
the same binary, which can support dynamic selection of correct
DT_MACHINE at runtime according to device tree.

Change-Id: I893cb7448870f14b2f97db9c06a8f2950870a2f3
Signed-off-by: Kaushal Kumar <kaushalk@codeaurora.org>