PM / Domains: Allocate memory outside domain locks

In preparation for supporting IRQ-safe domains, allocate domain data
outside the domain locks. These functions are not called in an atomic
context, so we can always allocate memory using GFP_KERNEL. By
allocating memory before the locks, we can safely lock the domain using
spinlocks instead of mutexes.

Reviewed-by: Kevin Hilman <[email protected]>
Acked-by: Ulf Hansson <[email protected]>
Signed-off-by: Lina Iyer <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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