Input: edt-ft5x06: Add DT support

[Lothar WaÃmann]

Changes wrt. v1:
addressed the comments from Jingoo Han and Mark Rutland
- added another patch to convert the driver to use devm_* functions
- removed sysfs reference from bindings documentation
- changed '_' to '-' in property name
- added 'edt,' prefix to properties names
- added sanity check for parameters read from DT
- cleaned up the gpio handling code

Changes wrt. v2:
- fixed the devm_* messup reported by Dmitry Torokhov
- added unit for report-rate property to the binding doc
- added separate patch to fix the reset delays

Changes wrt: v3:
- removed patches that have already been applied in the mean time
- ignore touchdown events, since those may report bad coordinates
- added support for a new firmware version

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