MAINTAINERS: Add linux-actions ML for Actions Semi Arch

Add the linux-actions mailing list for the Actions Semi architecture.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210205050722.8313-1-manivannan.sadhasivam@linaro.org

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>