arm64: tegra: Use consistent key code for force-recovery button

Some boards use the KEY_SLEEP input key code for the force-recovery
button, whereas others use BTN_1. The latter isn't valid because it only
applies to devices marked CAP_POINTER. Use KEY_SLEEP consistently for
all devices.

On certain Tegra234 devices there are definitions for a suspend key that
uses KEY_SLEEP, but I couldn't find any references to this key in any of
the board documents, so remove them.

Signed-off-by: Thierry Reding <treding@nvidia.com>

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