defconfig: enable reserved memory check on Lahaina

Enable a check to see if devices with reserved memory regions allocate from
those regions, when using the DMA API for allocations.  WARN_ON if check
doesn't pass.

Change-Id: Ic788dc4638d83cdf8a1e34f60efe678b9639d4b3
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>