drm/i915/gt: Prefer IS_ENABLED() instead of defined() on config option

Use IS_ENABLED() instead of defined() for checking whether a kconfig
option is enabled.

Signed-off-by: Nitin Gote <nitin.r.gote@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250103062651.798249-2-nitin.r.gote@intel.com

Author: NitinGote

drivers/gpu/drm/i915/gt/uc/intel_guc_log.c

@@ -18,7 +18,7 @@
 #define GUC_LOG_DEFAULT_CRASH_BUFFER_SIZE	SZ_2M
 #define GUC_LOG_DEFAULT_DEBUG_BUFFER_SIZE	SZ_16M
 #define GUC_LOG_DEFAULT_CAPTURE_BUFFER_SIZE	SZ_1M
-#elif defined(CONFIG_DRM_I915_DEBUG_GEM)
+#elif IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
 #define GUC_LOG_DEFAULT_CRASH_BUFFER_SIZE	SZ_1M
 #define GUC_LOG_DEFAULT_DEBUG_BUFFER_SIZE	SZ_2M
 #define GUC_LOG_DEFAULT_CAPTURE_BUFFER_SIZE	SZ_1M