PCI: dwc/intel-gw: Remove some unneeded function wrappers

Remove some of the pointless levels of functions that just wrap or group
a series of other functions.

Link: https://lore.kernel.org/r/20201105211159.1814485-5-robh@kernel.org


Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>