Simple Rotate Option for LCD Screens in “official" frames

[JohnN6]

The Official LCD screens for Raspberry Pi’s leave the display rotated 180 degrees when in the supplied cases. ( See https://support.thepihut.com/hc/en-us/articles/115002072865-Official-touchscreen-is-upside-down ).

It would be useful to have a block to handle this which would add the line
lcd_rotate=2
into /boot/config.txt
This rectifies screen and touch screen so that R Pi 3’s can go the usual LCD case and have the power cable at the top so they don’t topple over !