linuxkpi: Add `atomic_read_acquire()`

This function calls `raw_atomic_read_acquire()` which is also added.

They are located in <linux/atomic/*.h> headers, both included from
<linux/atomic.h>.

The

linuxkpi: Add `atomic_read_acquire()`

This function calls `raw_atomic_read_acquire()` which is also added.

They are located in <linux/atomic/*.h> headers, both included from
<linux/atomic.h>.

The amdgpu DRM driver started to use this in Linux 6.12.x.

Reviewed by: bz
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D56573

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