[PATCH v3 27/29] arm_mpam: Add helper to reset saved mbwu state

[Shaopeng Tan (Fujitsu)]

> resctrl expects to reset the bandwidth counters when the filesystem is
> mounted.
> 
> To allow this, add a helper that clears the saved mbwu state. Instead of cross
> calling to each CPU that can access the component MSC to write to the counter,
> set a flag that causes it to be zero'd on the the next read. This is easily done by
> forcing a configuration update.
> 
> Signed-off-by: James Morse <james.morse at arm.com>
> Reviewed-by: Fenghua Yu <fenghuay at nvdia.com>
> Tested-by: Fenghua Yu <fenghuay at nvidia.com>

Reviewed-by: Shaopeng Tan <tan.shaopeng at jp.fujitsu.com>