ARM: dts: msm: Add energy model for 8909w target

Add energy costs for 8909w target, which is used by
energy-aware scheduler for task placement. And remove
incorrect sched boot args.

Change-Id: I418eb5312263e30fdfa29f20c62a5c3794a2933b
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>