binman: Flesh out the p11-kit bintool docstring

The Sphinx-generated bintools.rst currently produces an empty section
for this bintool, since its class docstring is only a single line and
so the body under the heading is blank.

Extend the docstring with a short description of what p11-kit does and
how binman uses it, so the generated documentation has useful content.

Suggested-by: Heinrich Schuchardt <[email protected]>
Signed-off-by: Simon Glass <[email protected]>

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