PCI: iproc: Fix header comment "Corporation" misspelling

Fix an obvious "Broadcom Corporation" typo in a header comment.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Ray Jui <rjui@broadcom.com>