secure-core-image: pass encrypted password rather than plaintext password to usermod
secure-core-image: pass encrypted password rather than plaintext password to usermod

In oe-core commit 759df7395908f18b3b68f28d043ac9ebd42dd0c8, the
plaintext password setting function was dropped because of the security
issue. So the plaintext password setting method "usermod -P 'password'
user" is not available. Now we should pass the encrypted password to
usermod via -p option.

Signed-off-by: Yi Zhao <408a8b4035f86a985fba8f7a938866debfa07f2b@windriver.com>

jiazhang0/meta-secure-core,jiazhang0/meta-secure-core,jiazhang0/meta-secure-core,jiazhang0/meta-secure-core