myri_sbus: use request_firmware

Firmware blob looks like this...

        __be16 lanai4_data_size
        unsigned char lanai4_code[]
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

WHENCE

@@ -543,3 +543,13 @@ Licence: Allegedly GPL, but no source visible. Marked:
 Found in hex form in kernel source.
 
 --------------------------------------------------------------------------
+
+Driver: MYRI_SBUS - MyriCOM Gigabit Ethernet
+
+File: myricom/lanai.bin
+
+Licence: Unknown
+
+Found in hex form in kernel source.
+
+--------------------------------------------------------------------------