msm: clock-8084: Add USB ref_clk lookup entry
msm: clock-8084: Add USB ref_clk lookup entry

USB driver needs to vote diff_clk1 so add this clock in
clock lookup entry.

Change-Id: I983aa1f219d0f3e0219692c803dbe10908160c39
Signed-off-by: Tianyi Gou <5e5a6e33ed68686553dd14e04b1bf0fb8a6d8e7e@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas