libipt, query: change the disabled flag to enabled

The query decoder uses a flag to indicate that tracing is disabled;
the insn flow decoder uses a flag to indicate that tracing is enabled.

Align them by changing the query decoder's flag.

Change-Id: Ia3e3b14fd39daa96d1ab8ce8c41c8a3649297a72
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
libipt, query: change flags bit-vector into a series of bit-fields.

The query decoder uses a flags bit-vector; the insn flow decoder uses
bit-fields.  Change the query decoder to align them.

Change-Id: I8a8b7399e85142ede4d3d436e27c7c4dd0433825
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>