[REFACTOR] Hafnium style fixes and other minor fixes.

Change-Id: I8f10a1d82f0de9efc43894a3a7cdd09bbbcfc6ec
diff --git a/src/cpu.c b/src/cpu.c
index 92d17fd..f8beed6 100644
--- a/src/cpu.c
+++ b/src/cpu.c
@@ -46,7 +46,7 @@
  * TOCTOU issues while Hafnium performs actions on information that would
  * otherwise be re-writable by the VM.
  *
- * Each buffer is owned by a single cpu. The buffer can only be used for
+ * Each buffer is owned by a single CPU. The buffer can only be used for
  * spci_msg_send. The information stored in the buffer is only valid during the
  * spci_msg_send request is performed.
  */
@@ -158,7 +158,7 @@
 }
 
 /**
- * Searches for a CPU based on its id.
+ * Searches for a CPU based on its ID.
  */
 struct cpu *cpu_find(cpu_id_t id)
 {