ARM: dts: msm: disable internal pull up for 8909w BG

Touchscreen interrupt line is provided with external pull-up.
Pull down during touchscreen suspend causes leakage current.
Disable bias so that external pull-up alone drive the line.

Change-Id: Ic9fe4758de9c0912e98406107001dfb059faa11b
Signed-off-by: Venkata Prahlad Valluru <vvalluru@codeaurora.org>