OMAP3+: HSI: used simplified pointer dereference

Non trivial pointer dereferences were used to access some HSI data.

Replaced dev->device.parent by hsi_ctrl->dev
Replaced dev->ch->hsi_port->hsi_controller->lock by hsi_ctrl->lock

Change-Id: I8a7bb30bc1ecbd8bb59257c5134b83cd2de4b9e0
Signed-off-by: Djamil Elaidi <d-elaidi@ti.com>

Conflicts:
	drivers/omap_hsi/hsi_driver_if.c
OMAP4: HSI: reduced alarmist traces

Decreased level of some traces which are normal.

Change-Id: Ie9ce785270154fcdffbd1fe0aa620eff70f738bf
Signed-off-by: Djamil Elaidi <d-elaidi@ti.com>