adding support for ssd1351 128x96 display (#291)

* adding support for ssd1351 128x96 display

adding 128x96 and appropriate offset

* Addressed PR comments

Co-authored-by: Thijs Triemstra <info@collab.nl>
Co-authored-by: Richard Hull <rm_hull@yahoo.co.uk>

luma/oled/device/__init__.py

@@ -367,7 +367,7 @@ def offset(bbox):
         super(ssd1351, self).__init__(serial_interface, width, height, rotate, framebuffer, **kwargs)
 
     def _supported_dimensions(self):
-        return [(96, 96), (128, 128)]
+        return [(96, 96), (128, 128), (128, 96)]
 
     def _init_sequence(self):
         self.command(0xFD, 0x12)               # Unlock IC MCU interface