Revert "Revert "Revert "drivercore: Avoid adding devices without pm_ops to dpm list"""

This reverts commit 04f65062.

Not able to add device with PM core and causing suspend/resume
issue in I2C client driver.pm_ops are removed from I2C bus type
and should fall back on client driver pm_ops.

Reverting this change as we are not able to register I2C
client devices with PM core.

Change-Id: I9941fd71241d3e6c301c43c61715266fdbc02214
Signed-off-by: Harry Yang <harryy@codeaurora.org>