msm: clock-samarium: Add proper list of obj files for clocks

Target should compile individually when not sharing configs.  Add
proper obj files to compilation list for clock driver.

Change-Id: I8d5540ce7ae5a35b0e0d8c6684b95f6c25dbb4d6
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>