msm: clock-samarium: Remove USB HSIC clocks for msmsamarium

USB HSIC block does not exist in msmsamarium. Remove related RCG and
branches from clock driver.

Change-Id: I1ae08f7b08e21bbe7a8f60e81d2b573b1d13cd3e
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>