Code cleanup and ifdefs required for qurt build

Code that was previously out of tree that was #if 0, is now #ifdef __PX4_QURT.
These changes were required for flight using the qurt build.

Changes include code cleanup for shmem_posix.c.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/platforms/posix/px4_layer/shmem_posix.c

@@ -1,7 +1,6 @@
-
 /****************************************************************************
  *
- * Copyright (c) 2015 Ramakrishna Kintada. All rights reserved.
+ * Copyright (c) 2015 Vijay Venkatraman. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -32,7 +31,6 @@
  *
  ****************************************************************************/
 
-
 #include <px4_defines.h>
 #include <px4_posix.h>
 #include <string.h>
@@ -238,7 +236,6 @@ static void update_index_from_shmem(void)
 	release_shmem_lock();
 }
 
-
 static void update_value_from_shmem(param_t param, union param_value_u *value)
 {
 	unsigned int byte_changed, bit_changed;