arm: am57xx: cl-som-am57x: fix Ethernet

The module is continuously rebooting with the following message:
Net:   data abort
pc : [<fff77f42>]          lr : [<fff6e32b>]
reloc pc : [<80816f42>]    lr : [<8080d32b>]
sp : fdf5ce48  ip : fdf5d79c     fp : 00000017
r10: 8083cd58  r9 : fdf5cef0     r8 : fdf5d5d0
r7 : 48485000  r6 : 400000ff     r5 : fdf5d6e0  r4 : fdf5d618
r3 : fdf5d5b4  r2 : fdf5d5d0     r1 : 643a3631  r0 : fdf5d6e0
Flags: nzCv  IRQs off  FIQs off  Mode SVC_32
Resetting CPU ...

Modifications:
* Enable Ethernet configuration in the SPL.
* Update PINMUX of PHY enable GPIO.

Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/compulab/cl-som-am57x/mux.c b/board/compulab/cl-som-am57x/mux.c
index 5b71975..0db0609 100644
--- a/board/compulab/cl-som-am57x/mux.c
+++ b/board/compulab/cl-som-am57x/mux.c
@@ -102,7 +102,7 @@
 	{VIN2A_D22,  (IEN  | PDIS | PTD | M3) }, /* VIN2A_D22.RGMII1_RXD1 */
 	{VIN2A_D23,  (IEN  | PDIS | PTD | M3) }, /* VIN2A_D23.RGMII1_RXD0 */
 	/* Eth PHY1 reset GPIOs*/
-	{VIN1B_CLK1, (IDIS | PDIS | PTD | M14)}, /* VIN1B_CLK1.GPIO2_31 */
+	{VIN2A_CLK0, (IDIS | PDIS | PTD | M14)}, /* VIN2A_CLK0.GPIO3_28 */
 };
 
 #define SET_MUX(mux_array) do_set_mux32((*ctrl)->control_padconf_core_base, \