arm: rpi: perform XHCI firmware upload only once
XHCI firmware upload must be performed only once after initializing the PCI bridge. This fixes USB stack initialization after calling "usb stop; usb start" on Raspberry Pi 4B. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
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