powerpc/io: Use standard barrier macros in io.c
io.c uses open-coded barriers. Update it to use the equivalent but in macro form. Signed-off-by:Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20241218105523.416573-18-mpe@ellerman.id.au
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