Use vmalloc() to allocate Feather-Trace buffers

Allocating contiguous buffers with kmalloc() is subject to severe
maximum size limits. For Feather-Trace to work, we don't actually need
*physically* contiguous memory; virtually contiguous memory is
sufficient. By switching to vmalloc(), the code gets simpler and we
can support much larger buffers.

For convenience, this patch also adds a configuration option for
the desired Feather-Trace buffer size and increases the default
size.

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