arago-qt4: Add rotation to global environment variable script
arago-qt4: Add rotation to global environment variable script

* AM37x evm requires the screen to be rotated 90 degrees to look correct.
* Add the environment variable that changes this only for am37x evm

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

MentorEmbedded/meta-arago,rcn-ee/meta-arago,rcn-ee/meta-arago,MentorEmbedded/meta-arago,rcn-ee/meta-arago,MentorEmbedded/meta-arago,MentorEmbedded/meta-arago,rcn-ee/meta-arago,rcn-ee/meta-arago