[ofw] Allow hw\mlx4\kernel\bus\drv\pci.c to compile without warnings

[Smith, Stan]

Hi Leo,
  pci.c @ line 556 needs a (char*) cast on &vpd[3] in order to build in the x64 build environment without warnings which kill the build.

Stan.

556c556,557
<                       ("Found VPD of size %d, beginning with '%s'\n", *p_vpd_size, &vpd[3]));
---
>                       ("Found VPD of size %d, beginning with '%s'\n",
>                       *p_vpd_size, (char*)&vpd[3]));
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