lib: sbi: Apply budget restriction when polling Zkr CSR state transition

Zkr architecture doesn't define a time limit on state transitions
which results in hanging on unresponsive or event-driven platforms.
To prevent this, we need to limit polling iterations and fall back
in case the budget is over, and stack guard keeps its initial value.
The budget is configurable with CONFIG_ZKR_POLL_BUDGET, defaulting
to 1000 iterations. Successful reads do not consume a try.

Signed-off-by: Evgeny Voevodin <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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