clk: qcom: clock-a7: Add support to read various efuse registers

Some targets may support multiple efuse registers to decide upon the speed
bin for selecting the correct speed bin table. Add support for the
same.

Change-Id: Idf4b092dadbee7710648a5a139ddc37b983fa37d
Signed-off-by: Taniya Das <tdas@codeaurora.org>