IGD command added to CHIPSEC

The igd command allows memory read/write operations using igd dma.
>>> chipsec_util igd
>>> chipsec_util igd dmaread <address> [width] [file_name]
>>> chipsec_util igd dmawrite <address> <width> <value|file_name>
>>> chipsec_util igd dmaread 0x20000000 4
>>> chipsec_util igd dmawrite 0x2217F1000 0x4 deadbeef


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