PCI: brcmstb: Change field name from 'type' to 'soc_base'

PCI: brcmstb: Change field name from 'type' to 'soc_base'

The 'type' field used in the driver to discern SoC differences is
confusing; change it to the more apt 'soc_base'.

The 'base' is because some SoCs have the same characteristics as
previous SoCs so it is convenient to classify them in the same group.

Link: https://lore.kernel.org/linux-pci/20240815225731.40276-13-james.quinlan@broadcom.com
Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>