[Memory] Stub 3D state LED

include/kernel/config_mem.hpp

@@ -7,6 +7,7 @@ namespace ConfigMem {
 		KernelVersionMinor = 0x1FF80002,
 		KernelVersionMajor = 0x1FF80003,
 		AppMemAlloc = 0x1FF80040,
-		Datetime0 = 0x1FF81020
+		Datetime0 = 0x1FF81020,
+		LedState3D = 0x1FF81084
 	};
 }

src/core/memory.cpp

@@ -76,6 +76,7 @@ u8 Memory::read8(u32 vaddr) {
 		switch (vaddr) {
 			case ConfigMem::KernelVersionMinor: return u8(kernelVersion & 0xff);
 			case ConfigMem::KernelVersionMajor: return u8(kernelVersion >> 8);
+			case ConfigMem::LedState3D: return 1; // Report the 3D LED as always off (non-zero) for now
 			default: Helpers::panic("Unimplemented 8-bit read, addr: %08X", vaddr);
 		}
 	}