[lldb][AArch64] Fix crash loading core files on 32 bit systems

llvm#109934 added FPMR which
uses a bit in hwcaps greater than 31. So it marked the 1 with UL
which is fine on 64 bit systems but for 32 bit UL is 4 bytes.

Use ULL so we aren't invoking undefined behaviour.

Author: DavidSpickett

lldb/source/Plugins/Process/Utility/RegisterFlagsDetector_arm64.cpp

@@ -23,7 +23,7 @@
 #define HWCAP2_AFP (1ULL << 20)
 #define HWCAP2_SME (1ULL << 23)
 #define HWCAP2_EBF16 (1ULL << 32)
-#define HWCAP2_FPMR (1UL << 48)
+#define HWCAP2_FPMR (1ULL << 48)
 
 using namespace lldb_private;