Support shift when capslock in Romanian and Serbian

The KCM layouts for Romanian and Serbian have been recently added,
but using shift while capslock is activated won't produce
lowercase characters. This CL addresses that.

Bug: 299861742
Test: Flashed on device, tested with physical keyboard
Flag: EXEMPT resource only update
Change-Id: I748c775b8b1d3991b924ac577f6b58e54427ed9e