device: Increase DEVICE_PATH_MAX to 40

This change increases the maximum length of device path string to 40
characters to accommodate growing hierarchy of devices.

TEST=Ensured that "\_SB.PCI0.LPCB.EC0.CREC.TUN0.RT58" is correctly
added to SSDT.

Change-Id: Id2ef71a32b26e366b56c652942a247de4889544a
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43540
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/include/device/path.h

@@ -138,7 +138,7 @@ struct device_path {
 };
 
 
-#define DEVICE_PATH_MAX 30
+#define DEVICE_PATH_MAX 40
 #define BUS_PATH_MAX (DEVICE_PATH_MAX+10)
 
 extern const char *dev_path_name(enum device_path_type type);