rts: remove redundant rCCCS initialization

This commit removes the redundant logic of initializing each
Capability's rCCCS to CCS_SYSTEM in initProfiling(). Before
initProfiling() is called during RTS startup, each Capability's rCCCS
has already been assigned CCS_SYSTEM when they're first initialized.

(cherry picked from commit a7569495)

rts/Profiling.c

@@ -150,14 +150,6 @@ void initProfiling (void)
     // initialise our arena
     prof_arena = newArena();
 
-    /* for the benefit of allocate()... */
-    {
-        uint32_t n;
-        for (n=0; n < getNumCapabilities(); n++) {
-            getCapability(n)->r.rCCCS = CCS_SYSTEM;
-        }
-    }
-
 #if defined(THREADED_RTS)
     initMutex(&ccs_mutex);
 #endif