ARM: dts: msm: Configure PM8994 GPIO4 to serve as SMB SUSPEND

LiQUID8994 has a SUSPEND signal for SMB which should be by
default set as input no pull.

Change-Id: I6b593c37e64881daa5c713627e2541bcba35f23b
Signed-off-by: Eugene Yasman <eyasman@codeaurora.org>