[coreboot] [patch] vga cursor positioning and correct usage of VIDEO() macro fix (again)

[Jonathan A. Kollasch]

Make cursor positioning work by using both halves of the VGA cursor position register.

Have vga_scroll_up() and vga_clear_line() present row/column arguments to the VIDEO() macro in the right order.

Signed-off-by: Jonathan A. Kollasch 
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This had previously been change set 3186, but was lost when console video support was restructured.