MIPS: OCTEON: make get_system_type() thread-safe

MIPS: OCTEON: make get_system_type() thread-safe

get_system_type() is not thread-safe on OCTEON. It uses static data,
also more dangerous issue is that it's calling cvmx_fuse_read_byte()
every time without any synchronization. Currently it's possible to get
processes stuck looping forever in kernel simply by launching multiple
readers of /proc/cpuinfo:

	(while true; do cat /proc/cpuinfo > /dev/null; done) &
	(while true; do cat /proc/cpuinfo > /dev/null; done) &
	...

Fix by initializing the system type string only once during the early
boot.

Signed-off-by: Aaro Koskinen <[email protected]>
Cc: [email protected]
Reviewed-by: Markos Chandras <[email protected]>
Patchwork: http://patchwork.linux-mips.org/patch/7437/
Signed-off-by: James Hogan <[email protected]>