can: rcar_canfd: add __maybe_unused annotation to silence warning

Since commit

| dd3bd23 ("can: rcar_canfd: Add Renesas R-Car CAN FD driver")

the rcar_canfd driver can be compile tested on all architectures. On
non OF enabled archs, or archs where OF is optional (and disabled in
the .config) the compilation throws the following warning:

| drivers/net/can/rcar/rcar_canfd.c:2020:34: warning: unused variable 'rcar_canfd_of_table' [-Wunused-const-variable]
| static const struct of_device_id rcar_canfd_of_table[] = {
|                                  ^

This patch fixes the warning by marking the variable
rcar_canfd_of_table as __maybe_unused.

Fixes: ac42240 ("can: rcar: Kconfig: Add helper dependency on COMPILE_TEST")
Fixes: dd3bd23 ("can: rcar_canfd: Add Renesas R-Car CAN FD driver")
Link: https://lore.kernel.org/all/[email protected]
Cc: [email protected]
Cc: Cai Huoqing <[email protected]>
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

Author: marckleinebudde

drivers/net/can/rcar/rcar_canfd.c

@@ -2017,7 +2017,7 @@ static int __maybe_unused rcar_canfd_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(rcar_canfd_pm_ops, rcar_canfd_suspend,
 			 rcar_canfd_resume);
 
-static const struct of_device_id rcar_canfd_of_table[] = {
+static const __maybe_unused struct of_device_id rcar_canfd_of_table[] = {
 	{ .compatible = "renesas,rcar-gen3-canfd", .data = (void *)RENESAS_RCAR_GEN3 },
 	{ .compatible = "renesas,rzg2l-canfd", .data = (void *)RENESAS_RZG2L },
 	{ }