updatehub: Install just updatehub binary
updatehub: Install just updatehub binary

This removes the updatehub-setup-mock-env as it is not intended to be
used on the target. It reduces the package size by 30%.

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

UpdateHub/meta-updatehub,UpdateHub/meta-updatehub,UpdateHub/meta-updatehub