watchdog: octeon: use fixed length string for register names

Use fixed length string for register names. This saves 416 bytes
in text size.

Signed-off-by: Aaro Koskinen <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/octeon-wdt-main.c

···
 	}
 }
 
-static const char *reg_name[] = {
+static const char reg_name[][3] = {
 	"$0", "at", "v0", "v1", "a0", "a1", "a2", "a3",
 	"a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3",
 	"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",