SST ACPI probe is missing code

[avafyi]

A fix for the PCI-style SST probe (used by Edison) most likely broke the ACPI-style SST probe (not used by Edison). The fix moved code from context_init (shared by both probes) directly into the PCI probe function in order to resolve a dependency. This does not affect the Edison hardware but is something that we might want to address later. The relevant commit is 3a75bd0

[andy-shev]

Since we have established https://github.com/edison-fw/meta-intel-edison and upstream working on SOF (Sound Open Firmware), I think this entire question has to be revisited.