powerpc/mpc52xx: Properly update irq_desc when set_type() is called.
The MPC5200 PIC driver doesn't correctly update the .status field of
the irq_desc structure when the set_type hook is called. This patch
adds the required code.
Also cleans up the external IRQ typename field to be something easier
to read (very minor).
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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