msm: clock-9615: Prevent USB-HS clocks from voting on CXO

Due to power requirements arising from the USB bus suspend
feature, it is required that some USB-HS clocks be left on
across XO shutdown. Prevent these clocks from voting for
CXO in the sleep set.

CRs-Fixed: 376857
Change-Id: I38704fccaba26857f79dc0fc73672a95a050609b
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>