ARM: dts: msm8998: remove extra simulator panel nodes

Few of the similator panel dtsi files are included more
than once in the msm8998 panel dtsi file. Fix this to
avoid any compilation issues for DT-overlay.

Change-Id: I53f2c50c5a93400f34ef1176ec86b39bf687a87f
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>