Don't mask irqs in default hardware irq handler.

The latest PCI spec requires option roms to call default bios
    handler.  So, the bios must not mask irqs.
Also, make the default hw irq handlers less verbose.
diff --git a/src/config.h b/src/config.h
index cb9b1da..7b62faf 100644
--- a/src/config.h
+++ b/src/config.h
@@ -145,8 +145,8 @@
 #define DEBUG_ISR_74 9
 #define DEBUG_ISR_75 1
 #define DEBUG_ISR_76 10
-#define DEBUG_ISR_hwpic1 1
-#define DEBUG_ISR_hwpic2 1
+#define DEBUG_ISR_hwpic1 5
+#define DEBUG_ISR_hwpic2 5
 #define DEBUG_HDL_pnp 1
 
 #endif // config.h
diff --git a/src/pic.c b/src/pic.c
index aa0453a..382dcbb 100644
--- a/src/pic.c
+++ b/src/pic.c
@@ -34,20 +34,13 @@
 void VISIBLE16
 handle_hwpic1(struct bregs *regs)
 {
-    u8 isr = get_pic1_isr();
-    dprintf(DEBUG_ISR_hwpic1, "Got noisy pic1 irq %x\n", isr);
-    isr &= ~PIC1_IRQ2; // don't ever mask the cascaded irq
-    if (isr)
-        mask_pic1(isr);
+    dprintf(DEBUG_ISR_hwpic1, "handle_hwpic1 irq=%x\n", get_pic1_isr());
     eoi_pic1();
 }
 
 void VISIBLE16
 handle_hwpic2(struct bregs *regs)
 {
-    u8 isr = get_pic2_isr();
-    dprintf(DEBUG_ISR_hwpic2, "Got noisy pic2 irq %x\n", isr);
-    if (isr)
-        mask_pic2(isr);
+    dprintf(DEBUG_ISR_hwpic2, "handle_hwpic2 irq=%x\n", get_pic2_isr());
     eoi_pic2();
 }