rbcodec/dsp: restore configure loop in dsp_init() (FS#13386)
It seems removing this causes a crash on the Clip+ when playing
any file. Appears to be a timing-related issue as replacing the
loop with an mdelay() also fixes it. Needs further investigation
to identify the real cause of the problem, see FS#13386.
Change-Id: Ia93a2887a79b376de50563d6bb3bbc79cee11a1c