cxl/core: Remove duplicate declaration of devm_cxl_iomap_block()

The function devm_cxl_iomap_block() is only used in the core
code. There are two declarations in header files of it, in
drivers/cxl/core/core.h and drivers/cxl/cxl.h. Remove its unused
declaration in drivers/cxl/cxl.h.

Fixing build error in regs.c found by kernel test robot by including
"core.h" there.
Signed-off-by: Robert Richter <rrichter@amd.com>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/20221018132341.76259-2-rrichter@amd.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/core/regs.c

@@ -7,6 +7,8 @@
 #include <cxlmem.h>
 #include <cxlpci.h>
 
+#include "core.h"
+
 /**
  * DOC: cxl registers
  *

drivers/cxl/cxl.h

@@ -218,8 +218,6 @@ int cxl_map_device_regs(struct pci_dev *pdev,
 enum cxl_regloc_type;
 int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
 		      struct cxl_register_map *map);
-void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr,
-				   resource_size_t length);
 
 #define CXL_RESOURCE_NONE ((resource_size_t) -1)
 #define CXL_TARGET_STRLEN 20