[flashrom] [PATCH]Support large COM ports on Win32

[Patrick Georgi]

Hi,

Windows wants large COM ports (COM10 and higher) to be given in UPC
notation, ie. \.\COM10

To aid the user, the Win32 code now rewrites all devices with COM prefix
(case insensitive) to UPC. Tested with both high and low COM port.

Signed-off-by: Patrick Georgi