msm: 9625: Configure the arch_timer for device tree

Initialize the timer early to use the iomapped functions and
specify the timer base through the device tree so that it can
be mapped in a clean way.

Change-Id: I07f474c142fc5f5a88b0a63c4d92260eb2e12124
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>