davinci: mityomapl138: Use auto-probe to determine attached PHY ID

Current board configurations involving the MityDSP-L138 and MityARM-1808
only have one attached PHY, but it's address may not be the same.  Default
the behavior to auto-probe for the PHY and use the first one found.

Signed-off-by: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
diff --git a/arch/arm/mach-davinci/board-mityomapl138.c b/arch/arm/mach-davinci/board-mityomapl138.c
index e5d554c..606a6f2 100644
--- a/arch/arm/mach-davinci/board-mityomapl138.c
+++ b/arch/arm/mach-davinci/board-mityomapl138.c
@@ -29,7 +29,7 @@
 #include <mach/mux.h>
 #include <mach/spi.h>
 
-#define MITYOMAPL138_PHY_ID		"0:03"
+#define MITYOMAPL138_PHY_ID		""
 
 #define FACTORY_CONFIG_MAGIC	0x012C0138
 #define FACTORY_CONFIG_VERSION	0x00010001