mmc: quirks: enable clock gating for AR6004 card

This patch whitelists the AR6004 card for clock-gating.
The controller supports asynchronous interrupt functionality
which enables to receive interrupts from the card when clocks
are off. Hence, clocks can be turned off when idle.

This patch whitelists the card, to let the clock-gating
framework gate the clock during idle time.

Change-Id: I651f86e42595cc82f99093c06ee220a1d0ec95a9
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>