ARM: dts: msm: Fix pinctrl configuration for HS UART on sdmshrike

Add 'active' pinctrl configuration for SE13 4 wire UART
definition so as to use proper biasing for the CTS and Rx GPIOs.
While at this, also modify the 'compatible' string definitions
for UART nodes to align with internal drivers.

Change-Id: I062e462ad3a368238c8b8ae8d1182e45ff872348
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>