ARM: dts: msm8916: Remove reference to smdtty_gps_nmea

smdtty_gps_nmea node doesn't exist and referencing it
causes build failures. Remove the reference and fix build problems.

Change-Id: I614da3f20baf1392c17651c0279e578691b7ab08
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>