defconfigs: make xfs defconfig use master branch

If you are testing with just:

make defconfig-xfs

Then use the master branch on Linus tree by default. Note that
if CI tests will use instead:

make defconfig-xfs-cli

And they use a custom tree and ref specified by the command line
interface and so this change does not affect CI tests.

Signed-off-by: Luis Chamberlain <[email protected]>

Author: mcgrof

defconfigs/xfs

@@ -8,7 +8,7 @@ CONFIG_BOOTLINUX=y
 CONFIG_BOOTLINUX_9P=y
 CONFIG_BOOTLINUX_LINUS=y
 CONFIG_BOOTLINUX_TREE_LINUS=y
-CONFIG_BOOTLINUX_TREE_LINUS_REF_69_RC6=y
+CONFIG_BOOTLINUX_TREE_LINUS_REF_MASTER=y
 
 CONFIG_WORKFLOWS_TESTS=y
 CONFIG_WORKFLOWS_LINUX_TESTS=y