wifi: iwlwifi: Avoid disabling GCC specific flag with clang

Clang errors:

  drivers/net/wireless/intel/iwlwifi/iwl-devtrace.c:15:32: error: unknown warning group '-Wsuggest-attribute=format', ignored [-Werror,-Wunknown-warning-option]
  #pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
                                 ^
  1 error generated.

The warning being disabled by this pragma is GCC specific. Guard its use
with CONFIG_CC_IS_GCC so that it is not used with clang to clear up the
error.

Fixes: 4eca8cbf ("wifi: iwlwifi: suppress printf warnings in tracing")
Link: https://github.com/ClangBuiltLinux/linux/issues/1818Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20230315-iwlwifi-fix-pragma-v1-1-ad23f92c4739@kernel.orgSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-devtrace.c

@@ -12,7 +12,9 @@
 #include "iwl-trans.h"
 
 #define CREATE_TRACE_POINTS
+#ifdef CONFIG_CC_IS_GCC
 #pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
+#endif
 #include "iwl-devtrace.h"
 
 EXPORT_TRACEPOINT_SYMBOL(iwlwifi_dev_ucode_event);