USB: ci13xxx_msm_hsic: Add voting for io_cal_sleep_clk

Add voting for 10KHz clock for periodic calibration process
of HSIC I/O pads. While at it also remove usage of alt_core_clk
which is no longer present.

Change-Id: I533dda8f06da6bb5503dd5ec054d79950e0b75c4
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>