wifi: mwifiex: mark OF related data as maybe unused

The driver can be compile tested with !CONFIG_OF making certain data
unused:

  drivers/net/wireless/marvell/mwifiex/sdio.c:498:34: error: ‘mwifiex_sdio_of_match_table’ defined but not used [-Werror=unused-const-variable=]
  drivers/net/wireless/marvell/mwifiex/pcie.c:175:34: error: ‘mwifiex_pcie_of_match_table’ defined but not used [-Werror=unused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: krzk

drivers/net/wireless/marvell/mwifiex/pcie.c

@@ -172,7 +172,7 @@ static const struct mwifiex_pcie_device mwifiex_pcie8997 = {
 	.can_ext_scan = true,
 };
 
-static const struct of_device_id mwifiex_pcie_of_match_table[] = {
+static const struct of_device_id mwifiex_pcie_of_match_table[] __maybe_unused = {
 	{ .compatible = "pci11ab,2b42" },
 	{ .compatible = "pci1b4b,2b42" },
 	{ }

drivers/net/wireless/marvell/mwifiex/sdio.c

@@ -495,7 +495,7 @@ static struct memory_type_mapping mem_type_mapping_tbl[] = {
 	{"EXTLAST", NULL, 0, 0xFE},
 };
 
-static const struct of_device_id mwifiex_sdio_of_match_table[] = {
+static const struct of_device_id mwifiex_sdio_of_match_table[] __maybe_unused = {
 	{ .compatible = "marvell,sd8787" },
 	{ .compatible = "marvell,sd8897" },
 	{ .compatible = "marvell,sd8978" },