renamed "syscall" module to "svc" (more accurate naming)

src/core/CMakeLists.txt

@@ -33,7 +33,7 @@ set(SRCS    core.cpp
             hle/hle.cpp
             hle/config_mem.cpp
             hle/coprocessor.cpp
-            hle/syscall.cpp
+            hle/svc.cpp
             hle/kernel/kernel.cpp
             hle/kernel/thread.cpp
             hle/service/apt.cpp