grouper: update prebuilt kernel

71241c7 net/ping: handle protocol mismatching scenario

b/18512516 (moto APR) 9 panics at PC=ping_err+0x264/0x338
	   LR=ping_err+0x23c/0x338
Signed-off-by: Iliyan Malchev <malchev@google.com>

Change-Id: I8a14efb93d4b29b8da8a69678b9464186d173d89
1 file changed