ARM: dts: qcom: Add cpu nodes for qcom chipsets

Add cpu nodes which describe the cpu subsystem hardware
for APQ8084, MDM9630, MSM8226, MSM8610, MSMZIRC and their
derivatives.

Change-Id: I64ba54bec83e1c2a51782091b7424cedf2a7a0fc
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>