RM] pxa/ezx: setup gpio-keys for EzX phones

Setup gpio-keys for EzX phones

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Acked-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
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