test: dm: pci: Add cases for finding PCI capability APIs

Add several PCI capability and extended capability ID registers
in the swap_case driver, so that we can add test case for
dm_pci_find_capability() and dm_pci_find_ext_capability().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/swap_case.c b/drivers/misc/swap_case.c
index 790bb0c..bffb809 100644
--- a/drivers/misc/swap_case.c
+++ b/drivers/misc/swap_case.c
@@ -118,6 +118,27 @@
 		*valuep = result;
 		break;
 	}
+	case PCI_CAPABILITY_LIST:
+		*valuep = PCI_CAP_ID_PM_OFFSET;
+		break;
+	case PCI_CAP_ID_PM_OFFSET:
+		*valuep = (PCI_CAP_ID_EXP_OFFSET << 8) | PCI_CAP_ID_PM;
+		break;
+	case PCI_CAP_ID_EXP_OFFSET:
+		*valuep = (PCI_CAP_ID_MSIX_OFFSET << 8) | PCI_CAP_ID_EXP;
+		break;
+	case PCI_CAP_ID_MSIX_OFFSET:
+		*valuep = PCI_CAP_ID_MSIX;
+		break;
+	case PCI_EXT_CAP_ID_ERR_OFFSET:
+		*valuep = (PCI_EXT_CAP_ID_VC_OFFSET << 20) | PCI_EXT_CAP_ID_ERR;
+		break;
+	case PCI_EXT_CAP_ID_VC_OFFSET:
+		*valuep = (PCI_EXT_CAP_ID_DSN_OFFSET << 20) | PCI_EXT_CAP_ID_VC;
+		break;
+	case PCI_EXT_CAP_ID_DSN_OFFSET:
+		*valuep = PCI_EXT_CAP_ID_DSN;
+		break;
 	}
 
 	return 0;