spi: support hclk

this patch support hclk for AHB bus.

Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220321013922.24067-3-leilk.liu@mediatek.com


Signed-off-by: Mark Brown <broonie@kernel.org>