OMAP3: PM: Boot message is not an error, and not helpful, remove it

It shows up on the console despite using "silent" in the bootargs, and
it's really just noise in the boot log since PM init is always called.

Signed-off-by: Sanjeev Premi <premi@ti.com>
Cc: jhnikula@gmail.com
[khilman@ti.com: minor changelog edits]
Signed-off-by: Kevin Hilman <khilman@ti.com>