attr/m49601: use attr_t (uint16_t) for all attributes
In order to support bit depths higher than 8bit, this commit adds an attr_t type to represent attribute data. Existing uses of uint8_t and uint16_t are converted to attr_t.
In order to support bit depths higher than 8bit, this commit adds an attr_t type to represent attribute data. Existing uses of uint8_t and uint16_t are converted to attr_t.