net: dwc_eth_qos_adi: Add missing header

Following header dependency cleanups, an implicit dependence on env.h
was exposed in dwc_eth_qos_adi. However because this driver is not (yet)
enabled in any defconfigs, build tests did not identify the missing
header. This adds the missing #include so that the driver builds
correctly when enabled.

Signed-off-by: Greg Malysa <malysagreg@gmail.com>

drivers/net/dwc_eth_qos_adi.c

@@ -10,6 +10,7 @@
 
 #include <clk.h>
 #include <dm.h>
+#include <env.h>
 #include <net.h>
 #include <phy.h>
 #include <reset.h>