fx2lafw: Print device failed to renumerate error

fx2lafw: Print device failed to renumerate error

commit 378abfeac6cc94d88dc82b8481dec9c9f691f3da tried to solve a bug where
the fx2lafw driver would print "Device came back" even if a timeout had occured.

It solved that issue, but inadvertently introduced a new bug:
"Device came back" would be printed even if no firmware upload was performed.
This is counterintuitive, as the device is only reset when a firmware upload is
performed.

There are three cases:
i)   Firmware upload was successful
ii)  Firmware upload failed
iii) Firmware upload was NOT needed

Each case warrants a separate message from the driver. Print the
following messages depending on the outcome:

i)   "Device came back"
ii)  "Device failed to renumerate"
iii) "Firmware upload was not needed."

Signed-off-by: Alexandru Gagniuc <redacted>