usb: gadget: fastboot: Allocate IN requests when needed

fastboot_download_finished() calls fastboot_tx_print() two times in a
row and waits for completion in between. Additionally this is called
from the completion function from another request. This seems to work
for example on the fsl_udc driver, but leads to problems on the DWC3
controller. Instead of re-using the same request over and over again,
just allocate a new request when needed. This way we no longer have
to poll for its completion before starting a new request.
While fixing fastboot on the DWC3 controller this also makes the
lifetime of a request clearer.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

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