intel_scu_ipc: remove the un-neccessary capability check inside

intel_scu_ipc: remove the un-neccessary capability check inside
IPC ioctl calls. This prevents user space app (i.e. Android app)
from getting our fw information such as IFWI fw version.

BZ: 20905

Change-Id: I4b13346026c450f365111856ee89be2cc665f22c
Signed-off-by: Winson Yung <winson.w.yung@intel.com>
Reviewed-on: http://android.intel.com:8080/32689
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Reviewed-by: Mansoor, Illyas <illyas.mansoor@intel.com>
Reviewed-by: Yang, Bin <bin.yang@intel.com>
Tested-by: Wang, Zhifeng <zhifeng.wang@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>