ARM: dts: msm: Enable the UART1 entry in fsm9900 MTP

Enable the UART1 for fsm9900 MTP targets in order for user
space application to control the GSM NL HW over the UART1
serial port.

Change-Id: I0db7259eb954a1effb777f5be45e108d769cc6a5
Acked-by: Jie Luo <jluo@qti.qualcomm.com>
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>