refactor(libc): clean up dependencies in libc

- Removing platform dependencies from libc modules.
- Replacing panicking with actual error handling.
- Debug macros are included indirectly from assert.h. Removing
  "platform_def.h" from assert.h and adding "common/debug.h"
  where the macros are used.
- Removing hack for fixing PLAT_LOG_LEVEL_ASSERT to 40.
  Instead removing assert with expression, as this
  does not provide additional information.

Signed-off-by: Claus Pedersen <claustbp@google.com>
Change-Id: Icc201ea7b63c1277e423c1cfd13fd6816c2bc568
diff --git a/include/lib/libc/assert.h b/include/lib/libc/assert.h
index 486bbc2..462bb43 100644
--- a/include/lib/libc/assert.h
+++ b/include/lib/libc/assert.h
@@ -9,8 +9,6 @@
 
 #include <cdefs.h>
 
-#include <platform_def.h>
-
 #include <common/debug.h>
 
 #ifndef PLAT_LOG_LEVEL_ASSERT
@@ -18,9 +16,7 @@
 #endif
 
 #if ENABLE_ASSERTIONS
-# if PLAT_LOG_LEVEL_ASSERT >= LOG_LEVEL_VERBOSE
-#  define assert(e)	((e) ? (void)0 : __assert(__FILE__, __LINE__, #e))
-# elif PLAT_LOG_LEVEL_ASSERT >= LOG_LEVEL_INFO
+# if PLAT_LOG_LEVEL_ASSERT >= LOG_LEVEL_INFO
 #  define assert(e)	((e) ? (void)0 : __assert(__FILE__, __LINE__))
 # else
 #  define assert(e)	((e) ? (void)0 : __assert())
@@ -29,10 +25,7 @@
 #define assert(e)	((void)0)
 #endif /* ENABLE_ASSERTIONS */
 
-#if PLAT_LOG_LEVEL_ASSERT >= LOG_LEVEL_VERBOSE
-void __dead2 __assert(const char *file, unsigned int line,
-		      const char *assertion);
-#elif PLAT_LOG_LEVEL_ASSERT >= LOG_LEVEL_INFO
+#if PLAT_LOG_LEVEL_ASSERT >= LOG_LEVEL_INFO
 void __dead2 __assert(const char *file, unsigned int line);
 #else
 void __dead2 __assert(void);