memory: tegra30-emc: replace DEFINE_SIMPLE_ATTRIBUTE with DEFINE_DEBUGFS_ATTRIBUTE

Fix the following coccicheck warning:
drivers/memory/tegra/tegra30-emc.c:1322:0-23:WARNING:
tegra_emc_debug_max_rate_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE

Signed-off-by: jing yangyang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

drivers/memory/tegra/tegra30-emc.c

···
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_min_rate_fops,
+DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_min_rate_fops,
 			tegra_emc_debug_min_rate_get,
 			tegra_emc_debug_min_rate_set, "%llu\n");
 
···
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_max_rate_fops,
+DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_max_rate_fops,
 			tegra_emc_debug_max_rate_get,
 			tegra_emc_debug_max_rate_set, "%llu\n");