msm: clock-8960: Add missing cam2_clk entry for 8064

There is a cam2_clk on 8064 so add the default "no-device" entry
so that this clock is properly registered.

Change-Id: Ib0505c7d8cc8499d420b7907a8e07cc6d42b8904
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>