libs/utils/env: fix device setting for Android target
libs/utils/env: fix device setting for Android target

Device ID setting was assigned to NoneType object. This creates the
directionary with the proper entry for the device ID.

Signed-off-by: Michele Di Giorgio <99fd0b6f5a4e02a4022988691284da2a0299b046@arm.com>

bjackman/lisa,mdigiorgio/lisa,ARM-software/lisa,arnoldlu/lisa,JaviMerino/lisa,ARM-software/lisa,ARM-software/lisa,arnoldlu/lisa,bjackman/lisa,credp/lisa,ARM-software/lisa,joelagnel/lisa,mdigiorgio/lisa,joelagnel/lisa,credp/lisa,credp/lisa,credp/lisa