Revert "Update jailshouse to Claudio's version"

This reverts commit 73a0ca057fd9840f8b06b197caab76925ff2c0d3.

diff --git a/jailhouse b/jailhouse
index 3ba5054d3b38e0a9e4e23ef9b5fd2ac234738fa7..755c68b90a3bd131852b45d4afc18e3ab917d3ab 160000 (submodule)
--- a/jailhouse
+++ b/jailhouse
@@ -1 +1 @@
-Subproject commit 3ba5054d3b38e0a9e4e23ef9b5fd2ac234738fa7
+Subproject commit 755c68b90a3bd131852b45d4afc18e3ab917d3ab