memory: mtk-smi: Add clocks for smi-sub-common

SMI sub common only have one output port. thus it has only one gals
clocks(gals0). then, smi-sub-common require the three clocks(apb/smi/gals0)
in has_gals case.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Link: https://lore.kernel.org/r/20210914113703.31466-9-yong.wu@mediatek.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>