arch/sparc: Enable queued rwlocks for SPARC

arch/sparc: Enable queued rwlocks for SPARC

Enable queued rwlocks for SPARC. Here are the discussions on this feature
when this was introduced.
https://lwn.net/Articles/572765/
https://lwn.net/Articles/582200/

Cleaned-up the arch_read_xxx and arch_write_xxx definitions in spinlock_64.h.
These routines are replaced by the functions in include/asm-generic/qrwlock.h

Signed-off-by: Babu Moger <babu.moger@oracle.com>
Reviewed-by: HÃ¥kon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Reviewed-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit a37594f198363fd9321ece54440336fd4b2a9c8e)

Conflicts:

        arch/sparc/Kconfig
        arch/sparc/include/asm/spinlock_64.h

Orabug: 26183741
Signed-off-by: Allen Pais <allen.pais@oracle.com>