i965: Add gen8 blend state

i965: Add gen8 blend state

OLD:
0x00007340:      0x00800000:    BLEND:
0x00007344:      0x84202100:    BLEND:

NEW:
0x00007340:      0x00800000:    BLEND: Alpha blend/test
0x00007344:      0x0000000b84202100: BLEND_ENTRY00:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----
0x0000734c:      0x0000000b84202100: BLEND_ENTRY01:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----
0x00007354:      0x0000000b84202100: BLEND_ENTRY02:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----
0x0000735c:      0x0000000b84202100: BLEND_ENTRY03:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----
0x00007364:      0x0000000b84202100: BLEND_ENTRY04:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----
0x0000736c:      0x0000000b84202100: BLEND_ENTRY05:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----
0x00007374:      0x0000000b84202100: BLEND_ENTRY06:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----
0x0000737c:      0x0000000b84202100: BLEND_ENTRY07:
                        Color Buffer Blend factor ONE,ONE,ONE,ONE (src,dst,src alpha, dst alpha)
                        function ADD,ADD (color, alpha), Disables: ----

v2: Line length fixes, and const usage (Topi)
Safer initialization of name string (Topi)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>