Add mpact-cheriot simulator.

Change-Id: Ic133842cc762b1721200c6fb46cc2ee27e085f64

manifest.xml

diff --git a/manifest.xml b/manifest.xml
index f86a836..6c3e09b 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -18,6 +18,7 @@
 <manifest>
   <remote fetch="https://opensecura.googlesource.com" name="opensecura" review="https://opensecura-review.googlesource.com" />
   <remote name="android" fetch="https://android.googlesource.com" />
+  <remote name="mpact" fetch="https://mpact.googlesource.com" />
   <default remote="opensecura" revision="master" />
 
   <project name="build" path="build">
@@ -70,6 +71,7 @@
   <project name="sim/tests"                       path="sim/tests" />
   <project name="sim/tbm"                         path="sim/tbm" />
   <project name="sim/kelvin"                      path="sim/kelvin" />
+  <project remote="mpact" name="mpact-cheriot"    path="sim/mpact-cheriot" revision="main" />
 
   <!-- Opentitan -->
   <project name="3p/lowrisc/opentitan"            path="hw/opentitan-upstream" />