.gitattributes: Add entries for files that will move to ports/ dir.

Author: dpgeorge

.gitattributes

@@ -26,3 +26,14 @@ cc3200/hal/des.c -text
 cc3200/hal/i2s.c -text
 cc3200/hal/i2s.h -text
 cc3200/version.h -text
+ports/stm32/pybcdc.inf_template -text
+ports/stm32/usbd_* -text
+ports/stm32/boards/*/stm32f4xx_hal_conf.h -text
+ports/stm32/usbdev/** -text
+ports/stm32/usbhost/** -text
+ports/cc3200/hal/aes.c -text
+ports/cc3200/hal/aes.h -text
+ports/cc3200/hal/des.c -text
+ports/cc3200/hal/i2s.c -text
+ports/cc3200/hal/i2s.h -text
+ports/cc3200/version.h -text