drm/panfrost: Constify argument to has_hw_issue

Logically, this function is free of side effects, so any pointers it
takes should be const. Needed to avoid a warning in the next patch.
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220525145754.25866-4-alyssa.rosenzweig@collabora.com

drivers/gpu/drm/panfrost/panfrost_issues.h

@@ -251,7 +251,7 @@ enum panfrost_hw_issue {
 
 #define hw_issues_g76 0
 
-static inline bool panfrost_has_hw_issue(struct panfrost_device *pfdev,
+static inline bool panfrost_has_hw_issue(const struct panfrost_device *pfdev,
 					 enum panfrost_hw_issue issue)
 {
 	return test_bit(issue, pfdev->features.hw_issues);