Add support for looper fridges

Signed-off-by: Adam C. Emerson <aemerson@linuxbox.com>
Add 'woke' entry to fridgethr_context

Signed-off-by: Adam C. Emerson <aemerson@linuxbox.com>
Swallow LRU

Signed-off-by: Adam C. Emerson <aemerson@linuxbox.com>