sparc64 Kconfig and configs V1

sparc64 Kconfig and configs V1

I put NR_CPUS maximum at 2048 and NODES_SHIFT at 5. This should cover M5
for the moment. NR_CPUS needs some thought and analysis before going further.

I've modified the config files but only tested config-sparc on bare metal T4-2
local to me.  I test by copying uek-rpm/ol6/config-sparc .config,
make oldconfig and accepting defaults.

This doesn't mean bare metal T5 and Athena boots. It also doesn't mean an
LDOM guest will boot - not likely without more commits.

thanx,

bob

Signed-off-by: Bob Picco <bob.picco@oracle.com>