Convert Broadcom Kona family Secure Monitor bounce buffer bindings
to DT schema.

Changes during conversion:
  - move from misc to firmware subdirectory
  - add used, but previously undocumented SoC-specific compatibles
  - drop deprecated compatibles (they've been deprecated for ~10 years)
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Link: https://lore.kernel.org/r/20230618151308.GA23586@standask-GA-A55M-S2HPSigned-off-by: Florian Fainelli <florian.fainelli@broadcom.com>