ARM: dts: msm: Split qcom,msm-id for 8226

Update the MSM8226 device tree files to reflect the new
format of the qcom,msm-id property, where qcom,msm-id
describes the SoC version and qcom,board-id describes the
platform type and subvariant, rather than grouping these
attributes into a single property.

Change-Id: I1c1cb5302d797f0ebd6d774b411da7286cc2ca4a
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>