common/block/lpss: Add CLK read function into LPSS common

This patch add new API to read LPSS CLK register. Also combine multiple
LPSS_CLOCK_CTL_REG writes into a single write inside lpss_clk_update function.

Change-Id: I420919ad9154c4cf426bc232c5eb59d95fd698d2
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/20938
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed