serial: 8250_exar: Absorb remaining 8250_port INT0 support

Move INT0 clearing out of common, per-port serial8250_do_startup()
into PCI device probe/resume.

As described in commit 2c0ac5b48a35 ("serial: exar: Fix stuck MSIs"),
the purpose of clearing INT0 is to prevent the PCI interrupt line from
becoming stuck asserted, "which is fatal with edge-triggered MSIs".

Like the clearing via interrupt handler that moved from common code in
commit c7e1b4059075 ("tty: serial: exar: Relocate sleep wake-up
handling"), this clearing at startup can be better handled at the PCI
device level.

Cc: Jan Kiszka <[email protected]>
Cc: Sudip Mukherjee <[email protected]>
Signed-off-by: Aaron Sierra <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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