ARM: dts: msm: remove no-map for lk_pool on msm8996 auto boards

no-map is set for carve out memory, which means it will never be
brought back to system. While in kernel, such memory should be recycled
if no one uses it.

CRs-Fixed: 2168593
Change-Id: I06471db012927e82faee12149d14c79d7097cc1c
Signed-off-by: Guchun Chen <guchunc@codeaurora.org>