ARM: dts: mdm: Enable dynamic address for wlan ramdump

Currently, there are two method for wlan firmware ramdump,
one is use fixed address, and the other is use dynamic address.
As for fixed address, it was set by CrashScope tool, which is
not flexible. As long as the fixed address set in dts is not as
same as CrashScope use, coredump file will genreate failure.
So it's better to use dynamic alloc address for wlan firmware
coredump base address.

Change-Id: Ie7d553619604b13969ec2c368cc3d983af861af2
Signed-off-by: Chaoli Zhou <zchaoli@codeaurora.org>