[lldb/Plugin] Move DisassemblerLLVMC for consistency with plugin (NFC)

Rename the DisassemblerLLVMC directory from llvm to LLVMC to match the
plugin name.
diff --git a/lldb/source/API/SystemInitializerFull.cpp b/lldb/source/API/SystemInitializerFull.cpp
index 720f1aa..6ae5380 100644
--- a/lldb/source/API/SystemInitializerFull.cpp
+++ b/lldb/source/API/SystemInitializerFull.cpp
@@ -43,7 +43,7 @@
 #include "Plugins/Architecture/Arm/ArchitectureArm.h"
 #include "Plugins/Architecture/Mips/ArchitectureMips.h"
 #include "Plugins/Architecture/PPC64/ArchitecturePPC64.h"
-#include "Plugins/Disassembler/llvm/DisassemblerLLVMC.h"
+#include "Plugins/Disassembler/LLVMC/DisassemblerLLVMC.h"
 #include "Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOS.h"
 #include "Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.h"
 #include "Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.h"