cxl/pci: Rename CXL REGLOC ID

The current naming is confusing and wrong. The Register Locator is
identified by the DSVSEC identifier, not an offset.

Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NBen Widawsky <ben.widawsky@intel.com>
Link: https://lore.kernel.org/r/20210618003009.956929-1-ben.widawsky@intel.comSigned-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/cxl/pci.c

@@ -1086,7 +1086,7 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm)
 	LIST_HEAD(register_maps);
 	int ret = 0;
 
-	regloc = cxl_mem_dvsec(pdev, PCI_DVSEC_ID_CXL_REGLOC_OFFSET);
+	regloc = cxl_mem_dvsec(pdev, PCI_DVSEC_ID_CXL_REGLOC_DVSEC_ID);
 	if (!regloc) {
 		dev_err(dev, "register location dvsec not found\n");
 		return -ENXIO;

drivers/cxl/pci.h

@@ -13,7 +13,7 @@
 #define PCI_DVSEC_VENDOR_ID_CXL		0x1E98
 #define PCI_DVSEC_ID_CXL		0x0
 
-#define PCI_DVSEC_ID_CXL_REGLOC_OFFSET		0x8
+#define PCI_DVSEC_ID_CXL_REGLOC_DVSEC_ID	0x8
 #define PCI_DVSEC_ID_CXL_REGLOC_BLOCK1_OFFSET	0xC
 
 /* BAR Indicator Register (BIR) */