libertas: Davinci platforms need more time loading helper firmware

Davinci platforms apparently need more time in-between helper firmware
blocks.  Even though this is an increased delay, we only take this hit
once at initialization time.
Signed-off-by: NDan Williams <dcbw@redhat.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/if_sdio.c

@@ -499,6 +499,11 @@ static int if_sdio_prog_helper(struct if_sdio_card *card)
 		if (ret)
 			goto release;
 
+		/* On some platforms (like Davinci) the chip needs more time
+		 * between helper blocks.
+		 */
+		mdelay(2);
+
 		chunk_size = min(size, (size_t)60);
 
 		*((__le32*)chunk_buffer) = cpu_to_le32(chunk_size);