powerpc/powernv: Shorten EEH function names

[ Upstream commit 01f3bfb7804ae20aaf66884cf537f7dc2cdc1671 ]

The patch shortens names of EEH functions in powernv-eeh.c and no
logic change introduced by this patch.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>