msm: acpuclock: Delete legacy acpuclock-krait drivers

The acpuclock-krait driver and the corresponding chip specific files have
been replaced with the clock-krait and clock-krait-8974 driver and
corresponding DT nodes. So, delete the unused files.

Change-Id: I193f0ae37940b537dec4fdfc2a3638d8cb0bcf0a
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>