smdk4412-common: remove TARGET_SPECIFIC_HEADER_PATH

- no longer used

Change-Id: Id64f6f48bea69a3fe784b4f86db8b94ddb3c5c12
smdk4412-common: Enable home button wake setting && Remove unnecessary wallpaper overlay

Seriously, how did that wallpaper even get there.

Patch Set 2: Fix ub0r derp.

Change-Id: I51e0ee362a05ae61535e1530ef291da28861015a