Add support for the RG353PS to the Anbernic RGxx3. This device is a slightly pared down version of the RG353P with no eMMC, no touchscreen, and only 1GB of RAM. Refactor board logic so that all supported devices are defined with ADC values and that future boards can be added by just defining the board values in the device array. Signed-off-by: Chris Morgan <macromorgan@hotmail.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>