ARM: dts: msm: Separate dtb compilation for 32/64 bit variants of QCS405

Make separate dtbs for 32 and 64 bit build variants to achieve space
saving for boot partition.

Change-Id: I4dc330791950cd2a1c76bf78c9ca56015ee6e237
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>