Revert "vesa: Correct screencpy() prototype"

This reverts commit 15a67011987c341814533ac4d8e23c9a72dc7605, because
as Peter points out,

  The objects are uint32_t and so the prototype is correct.  It should
  not "leak" outside the screencpy function that we play ugly tricks
  with these pointers; that is better handled by an internal cast.

So do the necessary casting inside bios_vesacon_screencpy().

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
4 files changed