ARM: irq migration: update GIC migration code
This cleans up after the conversion to irq_data. Rename the function
to match the method, and remove the now useless lookup of the irq
descriptor which is never used. Move the bitmask calculation out of
the irq_controller_lock region.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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