soc: fsl: cpm1: qmc: Fix unused data compilation warning

In some configuration, compilation raises warnings related to unused
data. Indeed, depending on configuration, those data can be unused.

mark those data as __maybe_unused to avoid compilation warnings.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409071707.ou2KFNKO-lkp@intel.com/
Fixes: eb680d56 ("soc: fsl: cpm1: qmc: Add support for QUICC Engine (QE) implementation")
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Link: https://lore.kernel.org/r/20240909121129.57067-1-herve.codina@bootlin.comSigned-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>

drivers/soc/fsl/qe/qmc.c

@@ -2055,7 +2055,7 @@ static void qmc_remove(struct platform_device *pdev)
 	qmc_exit_xcc(qmc);
 }
 
-static const struct qmc_data qmc_data_cpm1 = {
+static const struct qmc_data qmc_data_cpm1 __maybe_unused = {
 	.version = QMC_CPM1,
 	.tstate = 0x30000000,
 	.rstate = 0x31000000,
@@ -2065,7 +2065,7 @@ static const struct qmc_data qmc_data_cpm1 = {
 	.rpack = 0x00000000,
 };
 
-static const struct qmc_data qmc_data_qe = {
+static const struct qmc_data qmc_data_qe __maybe_unused = {
 	.version = QMC_QE,
 	.tstate = 0x30000000,
 	.rstate = 0x30000000,