at91: Add esd gmbh OTC570 board support

This patch adds support for esd gmbh OTC570 board.
The OTC570 is based on an Atmel AT91SAM9263 SoC.

Signed-off-by: Daniel Gorsulowski <Daniel.Gorsulowski@esd.eu>
diff --git a/MAINTAINERS b/MAINTAINERS
index fe63a9f..5ad055e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -572,6 +572,7 @@
 Daniel Gorsulowski <daniel.gorsulowski@esd.eu>
 
 	meesc		ARM926EJS (AT91SAM9263 SoC)
+	otc570		ARM926EJS (AT91SAM9263 SoC)
 
 Sedji Gaouaou<sedji.gaouaou@atmel.com>
 	at91sam9g10ek		ARM926EJS (AT91SAM9G10 SoC)