The pci_epf_test_notifier function should be installed also if only
core_init_notifier is enabled. Fix the current logic.

Link: https://lore.kernel.org/r/20220825090101.20474-1-hayashi.kunihiko@socionext.com
Fixes: 5e50ee27 ("PCI: pci-epf-test: Add support to defer core initialization")
Signed-off-by: NKunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Acked-by: NOm Prakash Singh <omp@nvidia.com>
Acked-by: NKishon Vijay Abraham I <kishon@ti.com>