staging: sm750fb: convert pr_err to pr_info

This patch modifies few debug prints from pr_err() to pr_info() as they
fall under that category.

Signed-off-by: Hari Prasath Gujulan Elango <hgujulan@visteon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>