ARM: dts: qcom: Remove the psci node duplicate entry in kona

There is a duplicate entry for psci node in kona. This is not
required for any functionality, so remove the duplicate one.

Change-Id: Ife7ffb36a6c97afcdc221713d28c0e49b75bc472
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>