i40evf: set descriptor multiple to 32

Hardware requires descriptors to be allocated in groups of 32.

Change-ID: I752ccc96769d1bd8d3018c004b8aeff464045bf2
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40evf/i40evf.h

@@ -80,7 +80,7 @@ struct i40e_vsi {
 #define I40EVF_MIN_TXD       64
 #define I40EVF_MAX_RXD       4096
 #define I40EVF_MIN_RXD       64
-#define I40EVF_REQ_DESCRIPTOR_MULTIPLE  8
+#define I40EVF_REQ_DESCRIPTOR_MULTIPLE  32
 
 /* Supported Rx Buffer Sizes */
 #define I40EVF_RXBUFFER_64    64     /* Used for packet split */