[PATCH v0 linux master] i2c/busses: Avoid i2c interrupt status clear race condition.

[Ryan Chen]

> In AST2600 there have a slow peripheral bus between CPU  and i2c 
> controller.
> Therefore GIC i2c interrupt status clear have delay timing, when CPU 
> issue write clear i2c controller interrupt status.
> To avoid this issue, the driver need have read after write  clear at 
> i2c ISR.
> 
> Signed-off-by: ryan_chen <ryan_chen at aspeedtech.com>

>Applied to for-current with a Fixes tag, thanks! Please, try to add one next time and please also check how the subsystem formats the $subject line.
[Ryan Chen] Thanks your review, will add fixes tag at subject.