powerpc/eeh: Remove unused inline function eeh_dev_phb_init_dynamic()

commit 475028ef ("powerpc/eeh: Remove eeh_dev_phb_init_dynamic()")
left behind this, so can remove it.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210324140714.19612-1-yuehaibing@huawei.com