netd: bandwidthcontroller: use named quotas (via quota2)

Replace using the "quota" with "quota2".
Quota2 is SMP-safe, and allows sharing a quota between protocols.

Bug: 4646092
Change-Id: I69b1dd6d2c5c3b39cf0df175369ae5a28843d489
Signed-off-by: JP Abgrall <jpa@google.com>