intel_gtt: Raw PTE dumper mode
./tools/intel_gtt -d | head
GTT offset | PTEs
--------------------------------------------------------
0x000000 | 0xe4005015 0xe2854015 0xe283e015 0xe283f015
0x004000 | 0xe28ba015 0xe28bb015 0xe28b6015 0xe28b7015
0x008000 | 0xe2828015 0xe2829015 0xe282a015 0xe282b015
0x00c000 | 0xe2928015 0xe2929015 0xe292a015 0xe292b015
0x010000 | 0xe2918015 0xe2919015 0xe291a015 0xe291b015
0x014000 | 0xe291c015 0xe291d015 0xe291e015 0xe291f015
0x018000 | 0xe2920015 0xe2921015 0xe2922015 0xe2923015
0x01c000 | 0xe2924015 0xe2925015 0xe2926015 0xe2927015
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>