Update Buildroot 2019.02.8

buildroot/board/beaglebone/uEnv.txt

@@ -3,6 +3,9 @@ devtype=mmc
 bootdir=
 bootfile=zImage
 bootpartition=mmcblk0p2
+console=ttyS0,115200n8
+loadaddr=0x82000000
+fdtaddr=0x88000000
 set_mmc1=if test $board_name = A33515BB; then setenv bootpartition mmcblk1p2; fi
-set_bootargs=setenv bootargs console=ttyO0,115200n8 root=/dev/${bootpartition} rw rootfstype=ext4 rootwait
+set_bootargs=setenv bootargs console=${console} root=/dev/${bootpartition} rw rootfstype=ext4 rootwait
 uenvcmd=run set_mmc1; run set_bootargs;run loadimage;run loadfdt;printenv bootargs;bootz ${loadaddr} - ${fdtaddr}