kern: pass ini1 size from loader to kernel, remove slab memset from init0

libraries/libmesosphere/include/mesosphere/kern_initial_process.hpp

@@ -34,8 +34,14 @@ namespace ams::kern {
         uintptr_t _08;
     };
 
+    struct InitialProcessBinaryLayoutWithSize {
+        InitialProcessBinaryLayout layout;
+        size_t size;
+    };
+
     KPhysicalAddress GetInitialProcessBinaryPhysicalAddress();
-    void SetInitialProcessBinaryPhysicalAddress(KPhysicalAddress phys_addr);
+    size_t GetInitialProcessBinarySize();
+    void SetInitialProcessBinaryPhysicalAddress(KPhysicalAddress phys_addr, size_t size);
 
     u64 GetInitialProcessIdMin();
     u64 GetInitialProcessIdMax();