firewire: add read_csr_reg driver callback

To prepare for the following additions of more OHCI-implemented CSR
registers, replace the get_cycle_time driver callback with a generic
CSR register callback.

Signed-off-by: Clemens Ladisch <[email protected]>
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 50332b8..2e62516 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -1044,7 +1044,7 @@
 
 	local_irq_disable();
 
-	cycle_time = card->driver->get_cycle_time(card);
+	cycle_time = card->driver->read_csr_reg(card, CSR_CYCLE_TIME);
 
 	switch (a->clk_id) {
 	case CLOCK_REALTIME:      getnstimeofday(&ts);                   break;