sdparm: split sdparm-scripts subpkg

Bash scripts:
packages-split/sdparm/usr/bin/sas_disk_blink:#!/bin/bash
packages-split/sdparm/usr/bin/scsi_ch_swp:#!/bin/bash

The sdparm is a ~150K executable so making it pull in bash
at >1000K isn't good for embedded systems.

Neither script appears to be essential, so put them in sdparm-scripts as
Randy suggested.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>