PPC32 support

rio_hw_add_outb_message - Add message to the MPC85xx outbound message queue
rio_hw_add_inb_buffer - Add buffer to the MPC85xx inbound message queue
rio_hw_get_inb_message - Fetch inbound message from the MPC85xx message unit
fsl_rio_doorbell_send - Send a MPC85xx doorbell message
fsl_local_config_read - Generate a MPC85xx local config space read
fsl_local_config_write - Generate a MPC85xx local config space write
fsl_rio_config_read - Generate a MPC85xx read maintenance transaction
fsl_rio_config_write - Generate a MPC85xx write maintenance transaction
fsl_rio_tx_handler - MPC85xx outbound message interrupt handler
rio_open_outb_mbox - Initialize MPC85xx outbound mailbox
rio_close_outb_mbox - Shut down MPC85xx outbound mailbox
fsl_rio_rx_handler - MPC85xx inbound message interrupt handler
rio_open_inb_mbox - Initialize MPC85xx inbound mailbox
rio_close_inb_mbox - Shut down MPC85xx inbound mailbox
fsl_rio_dbell_handler - MPC85xx doorbell interrupt handler
fsl_rio_doorbell_init - MPC85xx doorbell interface init
fsl_rio_setup - Setup Freescale PowerPC RapidIO interface