asdk-libdrm

drm: Initialize or valgrind-clear modesetting ioctl arguments.

Fixes valgrind complaints in the modesetting driver.  I tried to
follow each ioctl's pattern for whether it was initializing just the
in values, or both in and out values.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: srinivas pulukuru <srinivas.pulukuru@ti.com>