Immediately apply transaction when hw rendering is disabled

When hw rendering is disabled, we can't merge the transaction with the
next frame because the frame drawing callback won't be invoked. Instead,
just apply the transaction immediately

Test: HW Rendering app can remove SV
Fixes: 205924676
Change-Id: Ia6adb6dbad0238c4d815c72efc9b73bf4ea9c84a