Revise sensor rate capping exemption

Also handle the case when mic access is disabled on the initial request,
not just if the access is toggled while the request is active.

Remove the exemption from regular event connection, since the request
parameters are shared across all clients (unlike direct channel), and
all known system clients do not need more than the capped rate, so this
change is unnecessary at present.

Bug: 409015086
Test: manual with dumpsys sensorservice
Flag: EXEMPT bugfix
Change-Id: I8e7cece2c7f56e909df1cd0eeb06b84450f6d467