Revert "radio-iris: Configure search direction as passed by FM APP"

As per V4L2 framework APP should pass the parameter as '1' to
search in forward direction and '0' to search in downward
direction. Reverting the change that was uploaded as it configured
the search direction directly that it received it from the APP.
APP should pass '1' for SEEK UP and '0' for SEEK DOWN . The driver
should check for the direction before configuring. To the FM SOC,
'0' means SEEK-UP and '1' means SEEK-DOWN. If APP passes '1' driver
understands that user is requesting SEEK-UP operation and will
configure the direction as '0'.

This reverts commit 4667d9d4

Change-Id: I64a4c2674281c0d405ff03f8cbff9956a27f6e40
Signed-off-by: Anantha Krishnan <ananthk@codeaurora.org>