subaru safety: fix mutations failures

[maxime-desroches]

Test these lines:

panda/board/safety/safety_subaru.h

Lines 103 to 105 in f5e1900

	int angle_meas_new = (GET_BYTES(to_push, 4, 2) & 0xFFFFU);
	// convert Steering_Torque -> Steering_Angle to centidegrees, to match the ES_LKAS_ANGLE angle request units
	angle_meas_new = ROUND(to_signed(angle_meas_new, 16) * -2.17);

panda/board/safety/safety_subaru.h

Lines 117 to 120 in f5e1900

	uint32_t fr = (GET_BYTES(to_push, 1, 3) >> 4) & 0x1FFFU;
	uint32_t rr = (GET_BYTES(to_push, 3, 3) >> 1) & 0x1FFFU;
	uint32_t rl = (GET_BYTES(to_push, 4, 3) >> 6) & 0x1FFFU;
	uint32_t fl = (GET_BYTES(to_push, 6, 2) >> 3) & 0x1FFFU;