Input: phytium-keypad: Add Phytium keypad driver

[studyhu]

This patch adds support for Phytium keypad controller driver on Phytium SoCs.

[deepin-ci-robot]

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[deepin-ci-robot]

Hi @studyhu. Thanks for your PR.

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[opsiff]

/ok-to-test

[deepin-ci-robot]

deepin pr auto review

This is the kernel driver for the PHYTIUM Keypad port. It supports
multiple keypad controller devices with a shared interrupt. It also
provides a simple input device for accessing the keypad.