pic: The default hardware interrupt handlers should not take a parameter

Hardware interrupt handlers don't take a parameter.  Remove the
incorrect (and unused) parameter from handle_hwpic1/2().

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/src/hw/pic.c b/src/hw/pic.c
index d8b9764..a13564a 100644
--- a/src/hw/pic.c
+++ b/src/hw/pic.c
@@ -101,14 +101,14 @@
 
 // Handler for otherwise unused hardware irqs.
 void VISIBLE16
-handle_hwpic1(struct bregs *regs)
+handle_hwpic1(void)
 {
     dprintf(DEBUG_ISR_hwpic1, "handle_hwpic1 irq=%x\n", pic_isr1_read());
     pic_eoi1();
 }
 
 void VISIBLE16
-handle_hwpic2(struct bregs *regs)
+handle_hwpic2(void)
 {
     dprintf(DEBUG_ISR_hwpic2, "handle_hwpic2 irq=%x\n", pic_isr2_read());
     pic_eoi2();