KVM: x86 emulator: introduce DstImmUByte for dst operand decode

#define DstAcc      (4<<1)	/* Destination Accumulator */

#define DstDI       (5<<1)	/* Destination is in ES:(E)DI */

#define DstMem64    (6<<1)	/* 64bit memory operand */

#define DstImmUByte (7<<1)	/* 8-bit unsigned immediate operand */

#define DstMask     (7<<1)

/* Source operand type. */

#define SrcNone     (0<<4)	/* No source operand. */

		decode_register_operand(&c->dst, c,

			 c->twobyte && (c->b == 0xb6 || c->b == 0xb7));

		break;

	case DstImmUByte:

		c->dst.type = OP_IMM;

		c->dst.addr.mem = c->eip;

		c->dst.bytes = 1;

		c->dst.val = insn_fetch(u8, 1, c->eip);

		break;

	case DstMem:

	case DstMem64:

		c->dst = memop;