Raspberry PI - Rotate screen

The defaults are as follows:

 display_rotate=0 #Normal
display_rotate=1 #90 degrees
display_rotate=2 #180 degrees


NOTE: You can rotate both the image and touch interface 180º by entering lcd_rotate=2 instead
display_rotate=3 #270 degrees
display_rotate=0x10000 #horizontal flip
display_rotate=0x20000 #vertical flip

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