[PATCH] sn2: serialize access to PROM chips

If we read and write the PROM chips at the same time, as might happen at boot 
when salinfo extracts MCA records and a user is checking the PROM revision 
in /proc/sgi_prominfo, an MCA might occur, since the PROM chips can't be 
accessed that way.  This patch fixes the problem for systems with new PROMs 
(>= 3.50) by using the SAL to do PROM reads.

Signed-off-by: Jesse Barnes <jbarnes@sgi.com>

Thanks,
Jesse

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