[Flag] Update default TPU cache coherency to be enabled

The TPU cache coherency was set to false by default for testing/migration purposes. Now that the applications have been verified to work with TPU cache coherency, this CL changes the default behavior of TPU cache coherency to be enabled.

Bug: 255828212

Test:
All child bugs in b/255828212. Speech, Camera, TPU internal tests.

Change-Id: I276bb227fad352ad0a71ab2f9b771720b90bb729
1 file changed