ENGR00258357-3: mlb: Reset whole CDR in init function

ENGR00258357-3: mlb: Reset whole CDR in init function

Reset whole CDR in init function. This will make mlb connection to MITB
more stable.
This is a missed part in mx6 rm's mlb section, but new in mlb's latest
spec DS62420AP2.pdf 12.1.1-1.
Without this patch, mlb may receive irq from MITB during initialization.
It might cause some connection issue that mlb can't receive data
sometimes. It was treat to be MITB's fault before we get the latest
spec.

Signed-off-by: Terry Lv <r65388@freescale.com>