defconfig: sdxpoorwills: Add memory dump v2 support

This enables memory dump feature. It allows various client
subsystems to register respective dump regions. This will
enable memory dump collection in case of a dump.

CRs-Fixed: 2197202
Change-Id: Iea209d78c1d6f3632a82d3cd135b33b086ecdc7d
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>