ARM: am3517_evm: Disable DM_I2C_COMPAT

DM_I2C_COMPAT is somehow being enabled outside of Kconfig, so
this explicitly undefines it in the header file, and brackets
the I2C initialization around an #ifdef to not manually
initialize the I2C controller when the DM_I2C is enabled.

Signed-off-by: Adam Ford <aford173@gmail.com>
Tested-by: Derald D. Woods <woods.technical@gmail.com>
diff --git a/include/configs/am3517_evm.h b/include/configs/am3517_evm.h
index 1fe81d8..a3d261b 100644
--- a/include/configs/am3517_evm.h
+++ b/include/configs/am3517_evm.h
@@ -23,8 +23,9 @@
 #define CONFIG_SYS_SPL_MALLOC_SIZE	0x100000
 
 #include <configs/ti_omap3_common.h>
-#undef CONFIG_SDRC	/* Disable SDRC since we have EMIF4 */
 
+#undef CONFIG_DM_I2C_COMPAT
+#define CONFIG_MISC_INIT_R
 #define CONFIG_REVISION_TAG
 
 /* Hardware drivers */