powerpc/eeh: Remove unused inline functions

pseries_eeh_init_edev() is used exclusively in eeh_pseries.c, make it
static and remove unused inline function.

pseries_eeh_init_edev_recursive() is only called from files build wich
CONFIG_HOTPLUG_PCI_RPA which depends on CONFIG_PSERIES and CONFIG_EEH,
so can remove the unused inline version.

Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220316104239.26508-1-yuehaibing@huawei.com