ARMV7: OMAP3: Add expansion board detection for Beagle

Beagle expansion boards contain an i2c eeprom to identify themselves.
This patch adds code to read and parse the eeprom contents.  It prints
the expansion board name and revision and modifies environment variables
as appropriate. This patch is based on the Overo expansion board code.

Signed-off-by: Koen Kooi <k-kooi@ti.com>
Signed-off-by: Steve Sakoman <steve.sakoman@linaro.org>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
index 1c9a007..e7d5bd0 100644
--- a/include/configs/omap3_beagle.h
+++ b/include/configs/omap3_beagle.h
@@ -152,6 +152,7 @@
 #define CONFIG_SYS_I2C_SLAVE		1
 #define CONFIG_SYS_I2C_BUS		0
 #define CONFIG_SYS_I2C_BUS_SELECT	1
+#define CONFIG_I2C_MULTI_BUS		1
 #define CONFIG_DRIVER_OMAP34XX_I2C	1
 
 /*