Fixed file description and applied doxygen style

Removed old style file description and documnetation and apply
doxygen synatx.

Change-Id: I3ac9f06d4f574bf3c79c6f6044cec3a7e2f6e4c8
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/drivers/interrupt_controller/loapic_intr.c b/drivers/interrupt_controller/loapic_intr.c
index 06c0a94..e876edd 100644
--- a/drivers/interrupt_controller/loapic_intr.c
+++ b/drivers/interrupt_controller/loapic_intr.c
@@ -1,5 +1,3 @@
-/* loApicIntr.c - Intel Pentium[234] Local APIC/xAPIC driver */
-
 /*
  * Copyright (c) 1984-2008, 2011-2015 Wind River Systems, Inc.
  *
@@ -16,8 +14,10 @@
  * limitations under the License.
  */
 
-/*
- * DESCRIPTION
+/**
+ * @file
+ * @brief LoApicIntr.c - Intel Pentium[234] Local APIC/xAPIC driver
+ *
  * This module is a driver for the local APIC/xAPIC (Advanced Programmable
  * Interrupt Controller) in P6 (PentiumPro, II, III) family processors
  * and P7 (Pentium4) family processors.  The local APIC/xAPIC is included