staging: dgnc: cls.c: changes var in cls_vpd function for sparse

This patch changes cls_vpd function's re_map_vpdbase variable
type and marker.

It removes these warnings found in cls.c:

warning: incorrect type in assignment (different address spaces)
  expected unsigned char [usertype] *re_map_vpdbase
  got void [noderef] <asn:2>*
warning: incorrect type in argument 1 (different address spaces)
  expected void const volatile [noderef] <asn:2>*addr
  got unsigned char [usertype] *
warning: incorrect type in argument 1 (different address spaces)
  expected void volatile [noderef] <asn:2>*addr
  got unsigned char [usertype] *re_map_vpdbase

The variables passed to readb needs to be of type u8
with a __iomem marker. re_map_vpdbase is passed into
readb in the code.

Signed-off-by: Lidza Louina <lidza.louina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>