hw: raise max amount of signal contexts

This is needed at least for the resource-request test since all available
interrupts are provided through a signal context.

fix #1123

base-hw/src/core/kernel/configuration.h

@@ -22,7 +22,7 @@ namespace Kernel
 		MAX_PDS              = 256,
 		MAX_THREADS          = 256,
 		MAX_SIGNAL_RECEIVERS = 2048,
-		MAX_SIGNAL_CONTEXTS  = 2048,
+		MAX_SIGNAL_CONTEXTS  = 4096,
 		MAX_VMS              = 4,
 		MAX_PRIORITY         = 128,
 	};