of: unittest: Fix of_unittest_pci_node() kconfig dependencies

of_unittest_pci_node test depends on both CONFIG_PCI_DYNAMIC_OF_NODES
and CONFIG_OF_OVERLAY. Move the test into the existing
CONFIG_OF_OVERLAY ifdef and rework the CONFIG_PCI_DYNAMIC_OF_NODES
dependency to use IS_ENABLED() instead. This reduces the combinations to
build.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308241954.oRNfVqmB-lkp@intel.com/
Fixes: 26409dd ("of: unittest: Add pci_dt_testdrv pci driver")
Cc: Lizhi Hou <lizhi.hou@amd.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230824221743.1581707-1-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Author: robherring

drivers/of/unittest.c

@@ -3799,14 +3799,6 @@ static __init void of_unittest_overlay_high_level(void)
 	mutex_unlock(&of_mutex);
 }
 
-#else
-
-static inline __init void of_unittest_overlay_high_level(void) {}
-
-#endif
-
-#ifdef CONFIG_PCI_DYNAMIC_OF_NODES
-
 static int of_unittest_pci_dev_num;
 static int of_unittest_pci_child_num;
 
@@ -3954,6 +3946,9 @@ static void __init of_unittest_pci_node(void)
 	struct pci_dev *pdev = NULL;
 	int rc;
 
+	if (!IS_ENABLED(CONFIG_PCI_DYNAMIC_OF_NODES))
+		return;
+
 	rc = pci_register_driver(&testdrv_driver);
 	unittest(!rc, "Failed to register pci test driver; rc = %d\n", rc);
 	if (rc)
@@ -3987,7 +3982,10 @@ static void __init of_unittest_pci_node(void)
 		pci_dev_put(pdev);
 }
 #else
-static void __init of_unittest_pci_node(void) { }
+
+static inline __init void of_unittest_overlay_high_level(void) {}
+static inline __init void of_unittest_pci_node(void) { }
+
 #endif
 
 static int __init of_unittest(void)