iio: imu: inv_mpu6515: disable continuous sensors across suspend

All non-wake continuous sensors are supposed to be disabled across
kernel suspend.  This patch fixes a corner case in inv_mpu_suspend()
where the non-wake continuous sensors were not getting disabled as
they should (disables accelerometer, compass, and gyro across suspend
if they're enabled).

Bug: 15286927

Change-Id: I8c99db5ccaff1f218059016affa9f5138a5cf56c
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>