ARM: dts: msm: Enable dload_type selection on SDMMAGPIE

Add dload_type device tree node to allow support for
selecting whether a full ramdump, minidump, or both
should be collected from target.

Change-Id: I69b72a617f07d9f95e6c40f7ede3b2b926e63800
Signed-off-by: Jitendra Sharma <shajit@codeaurora.org>