f_sdp: Change bInterval of interrupt endpoint to 3

Since the USB HID limits the maximum bandwidth(3072) for interrupt
endpoint transfers, when the bInterval set to 1, we can only support 3
boards to run sdp at the same time. In order to support more boards,
change the bInterval of interrupt endpoint to 3, which will not affect
the transmission speed.
Reviewed-by: NYe Li <ye.li@nxp.com>
Signed-off-by: NSherry Sun <sherry.sun@nxp.com>
Signed-off-by: NPeng Fan <peng.fan@nxp.com>

drivers/usb/gadget/f_sdp.c

@@ -186,7 +186,7 @@ static struct usb_endpoint_descriptor in_hs_desc = {
 	.bEndpointAddress =	1 | USB_DIR_IN,
 	.bmAttributes =	USB_ENDPOINT_XFER_INT,
 	.wMaxPacketSize =	512,
-	.bInterval =		1,
+	.bInterval =		3,
 };
 
 static struct usb_endpoint_descriptor out_hs_desc = {
@@ -196,7 +196,7 @@ static struct usb_endpoint_descriptor out_hs_desc = {
 	.bEndpointAddress =	1 | USB_DIR_OUT,
 	.bmAttributes =		USB_ENDPOINT_XFER_INT,
 	.wMaxPacketSize =	SDP_HID_PACKET_SIZE_EP1,
-	.bInterval =		1,
+	.bInterval =		3,
 };
 
 static struct usb_descriptor_header *sdp_runtime_descs[] = {