dt-bindings: rtc: mediatek: add mt6358 and mt6366 compatible

Add mt6358 and mt6366 compatible in devicetree-binding document for
MediaTek PMIC based RTC. mt6358 and mt6366 use same compatible data
to store RTC_WRTGR address offset.

mt6358-rtc should be used as fallback for mt6366-rtc.
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Signed-off-by: Yuchen Huang <yuchen.huang@mediatek.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220428092726.25814-2-allen-kh.cheng@mediatek.com

Documentation/devicetree/bindings/rtc/rtc-mt6397.txt

@@ -14,6 +14,8 @@ For MediaTek PMIC wrapper bus bindings, see:
 Required properties:
 - compatible: Should be one of follows
        "mediatek,mt6323-rtc": for MT6323 PMIC
+       "mediatek,mt6358-rtc": for MT6358 PMIC
+       "mediatek,mt6366-rtc", "mediatek,mt6358-rtc": for MT6366 PMIC
        "mediatek,mt6397-rtc": for MT6397 PMIC
 
 Example: