powerpc: mpc8xx: cleaning up watchdog
In preparation of migration to DM watchdog, clean up a bit.
The 8xx watchdog really is a HW watchdog, so declare it as is
then it goes through Kconfig
And the watchdog reset doesn't mind getting interrupted, so
no need to disable interrupts
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
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