SWDEV-484055 Fixes aborts in CPX mode

AMD_MAX_HSA_AGENTS=16 is too small for CPX which is 64
This patch moves to 256.

Change-Id: Ibcf51bc060a071698b439ba2486a1635765955f0

Author: ronlieb

offload/hostexec/services/amdgcn_hostexec.cpp

@@ -32,7 +32,7 @@
 #endif
 
 /// Defines how many GPUs are maximally supported on a system
-#define AMD_MAX_HSA_AGENTS 16
+#define AMD_MAX_HSA_AGENTS 256
 
 /** Opaque wrapper for signal */
 typedef struct {