scripts/make_fit.py: Drop explicit LZMA parallel compression

Parallel compression for LZMA was added using the plzip tool. However
plzip produces lzip format output, which is different from the raw LZMA
format that the lzma tool produces. This causes depthcharge (the second
stage bootloader on Chromebooks) to fail to load the payload.

Drop the explicit LZMA parallel compression toolchain. If the lzma tool
on the build machine is from xz-utils, then there's a chance parallel
compression is already enabled.

The xz-utils manpage says the following for the -T (threads) argument:

    Specify the number of worker threads to use.  Setting threads to a
    special value 0 makes xz use up to as many threads as the processor(s)
    on the system support.  The actual number of threads can be fewer than
    threads if the input file is not big enough for threading with the
    given settings or if using more threads would exceed the memory usage
    limit.

    [...]

    The default value for threads is 0.  In xz 5.4.x and older the default
    is 1.

Fixes: fcdcf22a34b0 ("scripts/make_fit: Support a few more parallel compressors")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Simon Glass <simon.glass@canonical.com>
Link: https://patch.msgid.link/20260212074308.2189032-1-wenst@chromium.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

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