fsi: Move defines to common header
The FSI master registers are common to the hub and AST2600 master (and
the FSP2, if someone was to upstream a driver for that).
Add defines to the fsi-master.h header, and introduce headings to
delineate the existing low level details.
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20191108051945.7109-8-joel@jms.id.au
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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