ARM: dts: msm: update PCIe WAKE for msm8998 to be pull-up

PCIe WAKE for msm8998 is set to pull-down. This configuration
can cause the wake signal to be trigerred in some scenarios.
WAKE gpio should be always pull-up for preventing false wakes.

Change-Id: I893ef8908437d2118238c6fd45809703b1f5e3bb
Signed-off-by: Alexei Avshalom Lazar <ailizaro@codeaurora.org>