EDAC, altera: Work around int-to-pointer-cast warnings

The altera edac driver passes a token from a DT resource as
resource_size_t into an SMC call, but casts it to an __iomem pointer and
then a plain void pointer inbetween, mixing three or four incompatible
types in the process. The compiler complains about one of the
conversions:

  drivers/edac/altera_edac.c: In function 'altr_init_a10_ecc_block':
  drivers/edac/altera_edac.c:1053:10: error: cast to pointer from integer of \
	  different size [-Werror=int-to-pointer-cast]
     base = (void __iomem *)res.start;
            ^
  drivers/edac/altera_edac.c: In function 'altr_edac_a10_probe':
  drivers/edac/altera_edac.c:2062:10: error: cast to pointer from integer of \
	  different size [-Werror=int-to-pointer-cast]
     base = (void __iomem *)res.start;

Using a static checker probably also notices the __iomem cast.  Solving
this properly isn't trivial, but simply casting to a 'uintptr_t' instead
of 'void __iomem *' makes it less wrong and should avoid the warnings.

Fixes: d5fc9125566c ("EDAC, altera: Combine Stratix10 and Arria10 probe functions")
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Thor Thayer <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: David Frey <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Christophe JAILLET <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

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