cxl: Include range.h in cxl.h

After commit aefeb286b960 ("libnvdimm: Don't use "proxy" headers"),
range.h may not be implicitly included, resulting in a build error:

  In file included from drivers/cxl/core/features.c:8:
  drivers/cxl/cxl.h:365:22: error: field 'hpa_range' has incomplete type
    365 |         struct range hpa_range;
        |                      ^~~~~~~~~
  drivers/cxl/cxl.h:562:22: error: field 'hpa_range' has incomplete type
    562 |         struct range hpa_range;
        |                      ^~~~~~~~~
  drivers/cxl/cxl.h:570:22: error: field 'hpa_range' has incomplete type
    570 |         struct range hpa_range;
        |                      ^~~~~~~~~
  drivers/cxl/cxl.h:803:22: error: array type has incomplete element type 'struct range'
    803 |         struct range dvsec_range[2];
        |                      ^~~~~~~~~~~

Include range.h in cxl.h explicitly to clear up the errors.

Fixes: aefeb286b960 ("libnvdimm: Don't use "proxy" headers")
Signed-off-by: Nathan Chancellor <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Ira Weiny <[email protected]>

Author: nathanchance

drivers/cxl/cxl.h

@@ -11,6 +11,7 @@
 #include <linux/log2.h>
 #include <linux/node.h>
 #include <linux/io.h>
+#include <linux/range.h>
 
 extern const struct nvdimm_security_ops *cxl_security_ops;