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.

I'm waiting for a deepin-community member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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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.