PCI: xilinx-cpm: Remove leftover bridge initialization

Some fields in the host bridge structure are now initialized
by default in the PCI/OF core functions therefore their
initialization in the host controller driver is superfluous.

Remove it.

Link: https://lore.kernel.org/r/20200904142710.8018-1-lorenzo.pieralisi@arm.com


Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Rob Herring <robh@kernel.org>