Fix v6.8 renamed symbols

[iam-TJ]

Commit 80c2b40a51393 upstream renamed min_buffers_needed to min_queued_buffers

[hipersayanX]

IMO it wound be better to provide the alternative code directly, for example, instead of defining V4L2_MIN_QUEUED_BUFFERS, do:

#if LINUX_VERSION_CODE < KERNEL_VERSION( 6, 8, 0)
self->queue.min_buffers_needed = AKVCAM_BUFFERS_MIN;
#else
self->queue.min_queued_buffers = AKVCAM_BUFFERS_MIN;
#endif

Because it looks weird to see a macro as a member of a structure, it breaks code styling, and it kinda prone to error.
Defining a macro would be ok if your are replacing another macro, for example:

// This is OK

// MISSING_MACRO is undefined

#ifndef MISSING_MACRO
#define MISSING_MACRO 
#endif

If a function changed its name but still preserve it parameters, i would prefer this:

#ifdef USE_NEW_FUNC
new_func(params);
#else
func(params);
#endif

Instead of

// NO NO NO

#ifdef USE_NEW_FUNC
#define func_name new_func
#else
#define func_name func
#endif

func_name(params);

Because with the frenetic development rhythm of the kernel, they can add or remove parameters at anytime, and with the first form it make the maintenance much easier.