ARM: dts: msm: Add dt node for earlydomain

Add DT node for early domain driver for msm8996 cdp
boards and remove reserved memory node for lk_pool
as it will be populated by bootloader if early domain
is enabled.

Change-Id: Iedcb4b47544a2355e98429a786d246351fdca75e
Signed-off-by: Vivek Kumar <vivekuma@codeaurora.org>