clk: qcom: debugcc-bengal: Add clock measure support for ipa_2x_clk

Add support for measure_only_ipa_2x_clk clock to measure the
frequency of gcc_ipa_2x_clk clock for Bengal.

Change-Id: I774911a4c1fab1c0d3044e8633f19db1d78a31e6
Signed-off-by: Naveen Yadav <naveenky@codeaurora.org>