powerpc/io: Wrap port calculation in a macro
The calculation of the IO port is repeated several times, wrap it in
a macro, in particular to avoid spelling out the cast multiple times.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20241218105523.416573-14-mpe@ellerman.id.au
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