at91: remove AT91_DBGU offset from dbgu register macro

to make the soc base specified at runtime instead of compiled time

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

arch/arm/mach-at91/at91sam9260.c

@@ -324,7 +324,7 @@ static void __init at91sam9xe_map_io(void)
 {
 	unsigned long cidr, sram_size;
 
-	cidr = at91_sys_read(AT91_DBGU_CIDR);
+	cidr = dbgu_readl(AT91_DBGU, CIDR);
 
 	switch (cidr & AT91_CIDR_SRAMSIZ) {
 		case AT91_CIDR_SRAMSIZ_32K: