tsec: Allow Ten Bit Interface address to be configurable

Allow the address of the Ten Bit Interface (TBI) to be changed in the
event of a conflict with another device.

Signed-off by: Joe Hamman <joe.hamman@embeddedspecialties.com>
diff --git a/drivers/tsec.h b/drivers/tsec.h
index 7bf3dee..2f0092a 100644
--- a/drivers/tsec.h
+++ b/drivers/tsec.h
@@ -70,7 +70,9 @@
 #define miim_end -2
 #define miim_read -1
 
-#define TBIPA_VALUE		0x1f
+#ifndef CFG_TBIPA_VALUE
+    #define CFG_TBIPA_VALUE	0x1f
+#endif
 #define MIIMCFG_INIT_VALUE	0x00000003
 #define MIIMCFG_RESET		0x80000000