[Open-graphics] VGA text mode C version

[Timothy Normand Miller]

Small change to the PCI_TW_INFO bit assignment:

You have:

let   PCI_TW_INFO_TYPE_MASK	= 0x03000000
let     PCI_TW_INFO_TYPE_ADDR	= 0x00000000
let     PCI_TW_INFO_TYPE_RCOUNT	= 0x01000000
let     PCI_TW_INFO_TYPE_WDATA	= 0x02000000

But I want to change it to be 1 to 3, like this:

parameter b_idle = 0;
parameter b_addr = 1;
parameter b_rcount = 2;
parameter b_write = 3;