clk: qcom: Add LPM Latency support for CPU clocks

This adds support of L2 pc for CPU clocks and also
dumps the reg values when rcg fails to update its
configuration.

Change-Id: Ie8d325a2aad19e548b00461551917523b0a0cbce
Signed-off-by: Chetan C R <cchinnad@codeaurora.org>