ARM: dts: msm: Support boards with PMI8996 and PMK8001 PMICs for msm8996v3

Some MSM8996 boards will employ the PMI8996 and PMK8001 PMICs.
Introduce the board level files whose hierarchy include the
corresponding qcom,pmic-id so that the bootloader is able to
pick compatible DTB blobs on boards which use PMI8996 and
PMK8001.

Change-Id: Ie3da81ca90546e32715a37c97f9dd22fe33de0ce
Signed-off-by: Sanrio Alvares <salvares@codeaurora.org>