ARM: dts: msm: Add dtsi for sa515m flashless

Add device tree include file which has the required memory map
change for flashless boot.
Add auto-boot property to distiguish flashless.

Change-Id: I23af55c46ff70df94c2586c10485f6164407bfb3
Signed-off-by: Akshaya Bhat <akshayab@codeaurora.org>