iwlwifi: pcie: prefer to load the firmware in one shot

Users complained about allocation failures, so we loaded
the firmware in small chunks (PAGE_SIZE). This makes the
firmware restart considerably slower.
So, always prefer to load it in one shot allocating a big
chunk of coherent, and use smaller chunks as a fallback
solution.

On my laptop, this reduces the fw loading time from 120ms
to 20ms.

Signed-off-by: Emmanuel Grumbach <[email protected]>
Reviewed-by: Moshe Island <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>

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