tma525c: add delay before releasing touch events

Mitigate the problem that focus window is not ready when we release the
touch events.

Test:
1. Set CPU refrequencies to 1708800, flash local build and then verify
   for 100 times that there's no unregistered swipe found.
2. Set CPU refrequencies to 1363200, flash local build and then verify
   for 100 times that there's no unregistered swipe found.
3. Set CPU refrequencies to 864000, flash local build and then verify
   for 100 times that there's no unregistered swipe found.
4. Set CPU refrequencies to 614400, flash local build and then verify
   for 100 times that there's no unregistered swipe found.

Bug: 325982179
Test: Verified with the 4 conditions above that there's no unregistered
swipe happened.
Change-Id: I888ef184159a850426eea10645f3d54980fe8bf8
Signed-off-by: Simon Wei <jentsewei@google.com>