ARM: dts: msm: Add clock entries for UFSHC node in 8084

UFS host controller (UFSHC) on APQ8084 requires following
clocks to be enabled to function properly -

Controller System clock:
        core_clk_src - Controller core clock source
	core_clk - Controller core clock

AHB/AXI interface clocks:
	iface_clk - AHB interface clock
	bus_clk - AXI bus master clock

PHY to controller symbol synchronization clocks:
	rx_lane0_sync_clk - RX Lane 0
	rx_lane1_sync_clk - RX Lane 1
	tx_lane0_sync_clk - TX Lane 0
	tx_lane1_sync_clk - TX Lane 1

Add DT entries for the supported clocks.

Although "clocks" property is required for DT, since MSM platforms
didn't move to standard clock bindings yet, use only the "clock-names"
property to list the clocks. This contradicts bindings but reduces the
effort to rework driver when the clock provider has actually moved to
device-tree.

Change-Id: If59ba8e058d999a5623cef5a0c35d3f412e34590
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>