Replace every license notices in drivers/clk/meson by SPDX license
identifiers, as described in license-rules.rst
Acked-by: NNeil Armstrong <narmstrong@baylibre.com>
Acked-by: NStephen Boyd <sboyd@kernel.org>
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>