linux-phytec-fsl

bus: tegra-aconnect: Make symbol tristate

The driver uses symbols that weren't being exported in earlier versions
of the Linux kernel and hence it had to be made bool. The exports have
been merged into v4.8-rc1, so the driver can now be built as a module
again.

Signed-off-by: Thierry Reding <treding@nvidia.com>