msm: clock-krypton: Add USB3 config clock for bus driver

Add an entry for USB3 AXI clock to allow bus driver to program QoS
registers for USB3.

Change-Id: I975d6f31ffc633cf8da36ffcee4b396783a12001
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>