media: mtk-mdp: Fix error handling in probe function

In the Linux kernel, the following vulnerability has been resolved:

media: mtk-mdp: Fix error handling in probe function

Add mtk_mdp_unregister_m2m_device() on the error handling path to prevent

resource leak.

Add check for the return value of vpu_get_plat_device() to prevent null

pointer dereference. And vpu_get_plat_device() increases the reference

count of the returned platform device. Add platform_device_put() to

prevent reference leak.