linuxkpi: Add macros for might_lock_nested() and lockdep_(re/un/)pin_lock()

[nc]

Summary

This is needed by the drm-kmod 5.7 update

[manu]

Please explain what they should do and why it's while (0) for us.

[nc]

Technically, from what I understand, these are macros to locks in the kernel for scheduling purposes, but as with other macros we aren't doing anything with them so we just use "do {} while (0)".

[manu]

In D30710#690140, @nc wrote:

Technically, from what I understand, these are macros to locks in the kernel for scheduling purposes, but as with other macros we aren't doing anything with them so we just use "do {} while (0)".

This should be in the commit message (and in the review message).