Update context object if split bounds changed

The RRS(runtime resolution switching) feature which supports users to
change resolution directly. Split-screen did not update the Context
object during the runtime resolution switching. That results in the
split layout can not get the proper resource in time.

This CL updates the new Context object whose resources are adjusted to
match the new given Configuration when the split bound is different
from existing. That’make sure to get the updated resources objects
when calculating the divider snap target for this case.

Bug: 235044746
Test: atest MultiWindowTests
Change-Id: I94d1a95c6b4aeb3bf1b75aed2e0b3008f036c968