intel/xeon_sp, mb/ocp/deltalake: Rework get_stack_busnos()

- Return the busno based on the stack number.
- Replace pci_mmio_read_config32 with pci_io_read_config32 to get the
  register value before mapping the MMIOCFG space.
- Remove the plural `s` as the function now provides one bus number.

Change-Id: I6e78e31b8ab89b1bdcfdeffae2e193e698385186
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49457
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lance Zhao
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions