can: sja1000: use common prefix for all sja1000 defines

This is a follow up patch to:

    f901b6b can: sja1000: fix define conflict on SH

That patch fixed a define conflict between the SH architecture and the sja1000
driver, by addind a prefix to one macro only. This patch consistently renames
the prefix of the SJA1000 controller registers from "REG_" to "SJA1000_".

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
diff --git a/drivers/net/can/sja1000/peak_pcmcia.c b/drivers/net/can/sja1000/peak_pcmcia.c
index 1a7020b..977901a 100644
--- a/drivers/net/can/sja1000/peak_pcmcia.c
+++ b/drivers/net/can/sja1000/peak_pcmcia.c
@@ -196,7 +196,7 @@
 	int c = (priv->reg_base - card->ioport_addr) / PCC_CHAN_SIZE;
 
 	/* sja1000 register changes control the leds state */
-	if (port == REG_MOD)
+	if (port == SJA1000_MOD)
 		switch (v) {
 		case MOD_RM:
 			/* Reset Mode: set led on */
@@ -509,11 +509,11 @@
 static inline int pcan_channel_present(struct sja1000_priv *priv)
 {
 	/* make sure SJA1000 is in reset mode */
-	pcan_write_canreg(priv, REG_MOD, 1);
-	pcan_write_canreg(priv, REG_CDR, CDR_PELICAN);
+	pcan_write_canreg(priv, SJA1000_MOD, 1);
+	pcan_write_canreg(priv, SJA1000_CDR, CDR_PELICAN);
 
 	/* read reset-values */
-	if (pcan_read_canreg(priv, REG_CDR) == CDR_PELICAN)
+	if (pcan_read_canreg(priv, SJA1000_CDR) == CDR_PELICAN)
 		return 1;
 
 	return 0;