multistrap: Add edgetpu repo to the sources

Additionally renames the repo to "edgetpu" to be more specific.

Change-Id: I8a615cf86087e7a8b3048bb78a59e48de7805443
diff --git a/multistrap.conf b/multistrap.conf
index c568853..45f3553 100644
--- a/multistrap.conf
+++ b/multistrap.conf
@@ -2,8 +2,8 @@
 arch=USERSPACE_ARCH
 cleanup=true
 unpack=true
-bootstrap=main bsp
-aptsources=main bsp
+bootstrap=main bsp edgetpu
+aptsources=main bsp edgetpu
 noauth=true
 
 [main]
@@ -16,7 +16,7 @@
 source=https://packages.cloud.google.com/apt
 suite=mendel-bsp-enterprise-chef
 
-[coral]
+[edgetpu]
 packages=
 source=https://packages.cloud.google.com/apt
 suite=coral-edgetpu-stable