phy: brcm-sata: Implement calibrate callback

Implement the calibration callback to allow turning on the Clock-Data
Recovery module clamping when necessary, e.g: during failure to identify
a SATA hard drive from ahci_brcm.c::brcm_ahci_read_id.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tejun Heo <tj@kernel.org>