drm/msm/sde: update misr support for crtc and encoder

Update misr support for crtc and encoder to allow
client to capture the misr on both software blocks.
Encoder will be able to capture misr only for video
mode interface. The patch also fixes the issues related
to misr debugfs file handling.

Format:
echo "enable/disable frame_count" > /sys/kernel/debug/
dri/0/crtc*/misr_data

Examples:
echo "1 14" > /sys/kernel/debug/dri/0/crtc*/misr_data
cat /sys/kernel/debug/dri/0/crtc*/misr_data

echo "1 0" > /sys/kernel/debug/dri/0/enc*/misr_data
cat /sys/kernel/debug/dri/0/enc*/misr_data

Change-Id: I74b23cd388e3c6e9e92bd3d97dfd76acc9246567
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>