[HfpMicSr] adds toggle in audio setting page.

Adds hfp mic sr toggle in audio setting page.
The toggle is only shown when the hfp mic sr feature is supported by
cras and the flag is on.

Design doc:http://docs/document/d/1Cv1DRAsC_XDA66LuD-4lmzMsUrWTk2EXQUDuCirzja4?resourcekey=0--aRStqr4ykw3dtHy-M8YWg

BUG=b:292018871
TEST=0. autoninja -C out/Default unit_tests && out/Default/unit_tests
     1. autoninja -C out_eve/Release chrome
     2. deploy to DUT and check the toggle manually

Change-Id: I7dd31bbf29274ea32cad9c602871dd2067d28211
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4678935


Commit-Queue: Cranel W <cranelw@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Elie Maamari <emaamari@google.com>
Cr-Commit-Position: refs/heads/main@{#1270564}