[tv] Set up the GPU caching parameters for emulator device

Default texture cache is way too small to be able to handle
large background images; this causes huge performance issues
in the emulator;
This CL tweaks the caching parameters to be on par with physical
devices

Bug=https://b.corp.google.com/u/0/issues/28752126

Change-Id: Ia6a023db7bc0452c82a837e687c0ffb8451ee7cb