Revert "OMAPFB: Do not suspend on FB BLANK, instead disable panel"

Recovery mode uses FBIOBLANK/UNBLANK. FBIOBLANK does a disable that
triggers a manager->blank. This disables the GFX pipeline, and it is not
enabled at all resulting in no UI during recovery mode.

Hence revert the commit bed3531a28969a07f08370fc657aa1982b892282.

Change-Id: I5e590569c99e3cc5b765e5ed33635d7a1d50971d
Signed-off-by: Varadarajan, Charulatha <charu@ti.com>