mbv: small refactor interrupts

mbv/hal/intc.cc

@@ -1,7 +1,9 @@
 #include "intc.h"
 
+// this interrupt controller is tied to the pol0 design
 #include "pol0.h"
 
+namespace intc {
 namespace {
 
 struct IntC {
@@ -22,7 +24,7 @@ struct IntC {
 IntC* intc = reinterpret_cast<IntC*>(INTC_BASE);
 Isr isrs[NIRQ] = {};
 
-}
+}  // namespace
 
 bool SetIrqEnabled(uint8_t irqn, bool enabled) {
     uint32_t mask = 1 << irqn;
@@ -60,3 +62,5 @@ void InterruptHandler() {
         }
     }
 }
+
+}  // namespace intc