usb: xhci: fixes in firmware loader for uPD720201 and uPD720202 w/o ROM

vkoul: fixed comments:
	used macros for timeout count and delay
	removed renesas_fw_alive_check
	cleaned renesas_fw_callback
	removed recurion for renesas_fw_download
	added MODULE_FIRMWARE

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Conflicts:
	drivers/usb/host/xhci-pci.c
Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>