Convert Broadcom Kona family SDHCI controller bindings to DT schema.

Changes during conversion:
  - also mark reg and interrupts as required
  - drop deprecated compatible (it's been deprecated for ~10 years)
Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/a1fd4092b8a31c2ee58a3cd4cca062db13197b45.1683548624.git.stano.jakubek@gmail.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>