Add Blackwell instructions test kernel and update linker script

- Add kernels/blackwell_insts/ with test kernel and input data
- Update linker script with extended memory layout
- Remove obsolete sgemm_tcore_blackwell Makefile
- Update VX_types.h and common.h

lib/include/VX_types.h

@@ -184,10 +184,10 @@
 #define VX_CSR_CORE_ID                  0xCC2
 #define VX_CSR_WARP_MASK                0xCC3
 #define VX_CSR_THREAD_MASK              0xCC4     // warning! this value is also used in LLVM
+#define VX_CSR_GCID                     0xCC5     // legacy global core id alias used by Radiance bootrom
 
 #define VX_CSR_NUM_THREADS              0xFC0
 #define VX_CSR_NUM_WARPS                0xFC1
 #define VX_CSR_NUM_CORES                0xFC2
 
 #endif // VX_TYPES_VH
-