wifi: allow config of default+verbose ring buffers

Add the ability to set the size of ring buffers for
both logging modes (default and verbose).

BUG=29225988
TEST=manual

Manual test: add some logging statements to WifiLogger,
verify that the default ring buffer size is 32KB,
and that the verbose ring buffer size is 1024KB.

Change-Id: I4b7bc0da41ba66d15f8e2b6f3c3d6d615691d507
(cherry picked from commit 6ae111026c558daceb0c879368ca2fb385079769)
(cherry picked from commit 6c7a90669ba72c55d5fc03a7b3ed4afadc575290)
2 files changed