arm64: configs: enable configs for msm899(2/4) basic support

Given the mimimal hardware support for msm899(2/4) currently.
A few config options are needed to allow for continued
development and booting.

The following are needed for continued development and
booting:
  -8994 pinctrl for serial support
  -Enable Global Glock Controller (gcc)

Signed-off-by: Jeremy McNicoll <jeremymc@redhat.com>
Signed-off-by: Andy Gross <andy.gross@linaro.org>