ARM: dts: msm: Add parrent clock "top_ahb_clk_src" for msm8953

Resolving the warning dump, because of incorect clock
"rate/prepare/enable" sequnce during CPP driver probe.

Info:
WARNING: CPU: 0 PID: 1 at drivers/clk/msm/clock-local2.c:233
[4.170285] Attempting to prepare camss_top_ahb_clk_src before
           setting its rate. Set the rate first!
[4.170287] Modules linked in:
--- snipped ---
[4.170293] Hardware name: Qualcomm Technologies, Inc. APQ8053
[4.170294] Call trace:
--- snipped ---
[4.170332] [<ffffffc000730370>] cpp_probe+0x354/0x680
[4.170336] [<ffffffc00050d7d4>] platform_drv_probe+0x38/0x84
--- snipped ---

Change-Id: Ie34b765a6bce58e6793e5c2fc3919c4f9d314978
Signed-off-by: Atanas Filipov <afilipov@codeaurora.org>