s390/diag: Convert MACHINE_HAS_DIAG9C to machine_has_diag9c()
Use static branch(es) to implement and use machine_has_diag9c() instead of a runtime check via MACHINE_HAS_DIAG9C. Reviewed-by:Vasily Gorbik <gor@linux.ibm.com> Signed-off-by:
Heiko Carstens <hca@linux.ibm.com> Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com>
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