ARM: dts: msm: Refactor IOT memory map configuration for apq8053

Refactor IOT based targets memory map to a separate file
and include it directly in all apq8053 based IOT targets.

Change-Id: I684f3c5ed750c1672c006df3ae44a82ece119332
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>