probe: Improve probe_frid to support both ARM and X86

To unify probing logic, we want to provide a new 'fdt_get_frid' as
equivalent call to `acpi_get_frid`. The `probe_frid` then can
support both X86 and ARM platforms.

TEST=emerge-$BOARD mosys

Change-Id: I1d9b86441a1c470946db1c27a72b4e66a305ce7b
Tested-by: Hung-Te Lin <>
Commit-Ready: Hung-Te Lin <>
Legacy-Commit-Queue: Commit Bot <>
Reviewed-by: Hsin-Yi Wang <>
3 files changed