ssbi: Fix SSBI2 write bug

Fixed ssbi2.0 write by changing RD to WR

Change-Id: Id9048779d9026d6b085cf15f11a6722d828629c8
Acked-by: Edward Rodrigues <erodrigu@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>