Mark mendel-day repos as trusted

E: The repository 'http://packages.cloud.google.com/apt mendel-day InRelease' is not signed.
E: The repository 'http://packages.cloud.google.com/apt mendel-bsp-enterprise-day InRelease' is not signed.

Change-Id: I2b66b6fa59d9cf0e87b2bd3a506b59234bda971c
1 file changed