Updating default.xml

Change-Id: Ie92b4094b77ef54eeebed2c61845115240346cf7

Author: seL4-ci

default.xml

@@ -31,7 +31,7 @@
   <project name="picotcp.git" path="projects/picotcp" remote="picotcp" revision="13c00a067190f5ec62340ed932a2bb833c366d63" upstream="refs/tags/v1.7.0" dest-branch="refs/tags/v1.7.0"/>
   <project name="polly" path="tools/polly" remote="polly" revision="ef7e79c2c297d456f2742fd0b976f555d058d4e0" upstream="master" dest-branch="master"/>
   <project name="projects_libs.git" path="projects/projects_libs" revision="250ebdc6a1b74ddb12f99eee34c2b41570fe0afa" upstream="master" dest-branch="master"/>
-  <project name="seL4.git" path="kernel" revision="0a72b4cfcdf7b1068e57cd40e258cf9c0b7c8661" upstream="master" dest-branch="master"/>
+  <project name="seL4.git" path="kernel" revision="81679f2b95227675bc5a95e2fb2c6a8fbc01cd5e" upstream="master" dest-branch="master"/>
   <project name="seL4_libs" path="projects/seL4_libs" revision="54539a72dbc7bccd9b783bab158e4035fccf6562" upstream="master" dest-branch="master"/>
   <project name="seL4_projects_libs.git" path="projects/seL4_projects_libs" revision="bca46738daa52b2d29b9bf8070bca046c3f04964" upstream="master" dest-branch="master"/>
   <project name="seL4_tools.git" path="tools/seL4" revision="4aff58eb44c26bb92c8dd7c64a6d4acfc1d2e2ed" upstream="master" dest-branch="master">