tty: serial: unify TX space reads under altera_jtaguart_tx_space()

TX space reads from the control register are performed in various forms
on 4 places in altera_jtaguart. Unify all those and do the read and
masking on a single place.

The new helper altera_jtaguart_tx_space() uses FIELD_GET(), so we can
drop ALTERA_JTAGUART_CONTROL_WSPACE_OFF now.

Cc: Tobias Klauser <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Acked-by: Tobias Klauser <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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