Fix off-by-one error in sizing pSeries hcall table

The pSeries machine uses two tables to look up guest hcalls for emulation.
One of these is exactly one entry too small to hold all the hcalls it needs
to, leading to memory corruption.

This patch fixes the bug, and while we're at it, make both tables 'static'
since they're never used from other modules.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
