sparc64: cache_line_size() returns larger value for cache line size.

sparc64: cache_line_size() returns larger value for cache line size.

SPARC currently returns L1 data cache line size (as low as 32 bytes on
some systems) though L2 and L3 cache line sizes may be higher.  As
cache_line_size() is used by code to align memory requests to prevent
unnecessary cache line sharing, this patch returns the max of L2 and L3
sizes, currently 64 bytes.

OraBug: 26045057

Signed-off-by: Chris Hyser <chris.hyser@oracle.com>
Reviewed-by: Rob Gardner <rob.gardner@oracle.com>
Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com>