[1.0] Drop Non-GKI Support (#1483)

Co-authored-by: weishu <twsxtd@gmail.com>

kernel/kernel_compat.h

@@ -24,10 +24,6 @@ extern long ksu_strncpy_from_user_nofault(char *dst,
 					  const void __user *unsafe_addr,
 					  long count);
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI)
-extern struct key *init_session_keyring;
-#endif
-
 extern void ksu_android_ns_fs_check();
 extern struct file *ksu_filp_open_compat(const char *filename, int flags,
 					 umode_t mode);