dt-bindings: clk: g12a-clkc: Add NNA CLK Source clock IDs

This adds the Neural Network Accelerator IP source clocks.

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200610083012.5024-2-narmstrong@baylibre.com