arm: dts: msm: Add overlay/non-overlay support for SDM450 no-pmi config

Add dts files for both overlay and non-overlay NO-PMI configuration
for SDM450. While at it, remove the board-id configuration from the
soc NO-PMI file.

Change-Id: I9ad8f6b2a5fc030d206c97f081c8fd58a0f26af8
Signed-off-by: Kavya Nunna <knunna@codeaurora.org>