[serial] Improve serial driver chip detect and FIFO handling #575
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Fixes from @Mellvik for improved serial chip identification and FIFO operation.
Thanks @Mellvik!
Fixes some problems discussed in #515.
Replaced probe routine with updated version, removed old probe routine.
FIFO enabled for 16550A chips or newer.
FIFO trigger set to 14 characters.
Interrupt receive data buffer increased to 16 characters.
'flush_input_fifo' is a NOP when FIFO on.