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/drivers/arm/gic/v3/gic-x00.c b/drivers/arm/gic/v3/gic-x00.c
index 75eb69a..83ef32f 100644
--- a/drivers/arm/gic/v3/gic-x00.c
+++ b/drivers/arm/gic/v3/gic-x00.c
@@ -16,6 +16,7 @@
 #include <assert.h>
 
 #include <arch_helpers.h>
+#include <common/debug.h>
 #include <drivers/arm/arm_gicv3_common.h>
 #include <drivers/arm/gicv3.h>