To use this image on Pi2 remove the following lines from /boot/config.txt :
arm_freq=1200
arm_freq_min=600
If /boot/config.txt used conditional filters,
Ref: Raspberry Pi Documentation - Configuration
the arm_freq variables could be handled automatically, i.e, no user intervention required.
Something similar to
[pi3]
arm_freq=1200
arm_freq_min=600
[pi2]
arm_freq=900
arm_freq_min=600
[all]
would remove the need to modify the config.txt file when used with a Pi 2.
The Pi Zero and the Pi 1 can be accommodated this way, as well.
Details at the link above.