dma: ti: k3-udma: add missing <net.h> include

net.h is needed for PKTBUFSRX. Without this definition, the driver will
always use 4 RX buffers, causing am65-cpsw-nuss initialization to fail
when a higher number of buffers is requested.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 8e11d81..e92ede5 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -11,6 +11,7 @@
 #include <asm/io.h>
 #include <asm/bitops.h>
 #include <malloc.h>
+#include <net.h>
 #include <linux/bitops.h>
 #include <linux/dma-mapping.h>
 #include <linux/sizes.h>