i2c: pasemi: Improve timeout handling

The hardware (supposedly) has a 25ms timeout for clock stretching
and the driver uses 100ms which should be plenty.
The interrupt path however misses handling for errors while waiting for
the completion and the polling path uses an open-coded readx_poll_timeout.
Note that we drop reg_write(smbus, REG_SMSTA, status) while fixing those
issues here which will be done anyway whenever the next transaction starts
via pasemi_smb_clear.

Signed-off-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20250427-pasemi-fixes-v3-2-af28568296c0@svenpeter.dev


Signed-off-by: Andi Shyti <andi.shyti@kernel.org>