arm: socfpga: misc: Reset ethernet from OF

Reset the GMAC ethernets based on the "resets" OF node instead of ad-hoc
hardcoded values in the U-Boot code. Since we don't have a proper reset
framework in place yet, we have to do this slightly ad-hoc parsing of the
OF tree instead.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/include/fdtdec.h b/include/fdtdec.h
index c9a5c9a..eac679e 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -181,6 +181,7 @@
 	COMPAT_SOCIONEXT_XHCI,		/* Socionext UniPhier xHCI */
 	COMPAT_INTEL_PCH,		/* Intel PCH */
 	COMPAT_INTEL_IRQ_ROUTER,	/* Intel Interrupt Router */
+	COMPAT_ALTERA_SOCFPGA_DWMAC,	/* SoCFPGA Ethernet controller */
 
 	COMPAT_COUNT,
 };