ARM: dts: Modify OCMEM aggregation method for apq8084

Modify the aggregation method for OCMEM to allow multiple clients
to vote for OCMEM core clk on APQ8084. Make the OCMEM core clock
a clock associated with the virtual NOC.

Change-Id: Ica8c2a351ce5c21447c45679185b9281706a0639
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>