msm: clock-8084: Add measurement support for gcc_bimc_clk

In order to measure the ddr freq, gcc_bimc_clk measurement is
introduced and it can be multiplied by 2 to get ddr freq.

Change-Id: Ie06e6c8a4e9bfccf578d31bd0e7ca3394ebc7cc7
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>