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/plat/arm/common/arm_bl1_setup.c b/plat/arm/common/arm_bl1_setup.c
index 7a9e04d..7000236 100644
--- a/plat/arm/common/arm_bl1_setup.c
+++ b/plat/arm/common/arm_bl1_setup.c
@@ -11,6 +11,7 @@
 #include <arch.h>
 #include <bl1/bl1.h>
 #include <common/bl_common.h>
+#include <common/debug.h>
 #include <lib/fconf/fconf.h>
 #include <lib/fconf/fconf_dyn_cfg_getter.h>
 #include <lib/utils.h>
diff --git a/plat/arm/common/arm_dyn_cfg_helpers.c b/plat/arm/common/arm_dyn_cfg_helpers.c
index 6a2a6f8..e88ea65 100644
--- a/plat/arm/common/arm_dyn_cfg_helpers.c
+++ b/plat/arm/common/arm_dyn_cfg_helpers.c
@@ -6,6 +6,7 @@
 
 #include <assert.h>
 
+#include <common/debug.h>
 #if MEASURED_BOOT
 #include <common/desc_image_load.h>
 #endif
diff --git a/plat/arm/common/arm_gicv3.c b/plat/arm/common/arm_gicv3.c
index 4a3a22e..469e22a 100644
--- a/plat/arm/common/arm_gicv3.c
+++ b/plat/arm/common/arm_gicv3.c
@@ -7,6 +7,7 @@
 #include <assert.h>
 #include <platform_def.h>
 
+#include <common/debug.h>
 #include <common/interrupt_props.h>
 #include <drivers/arm/gicv3.h>
 #include <lib/utils.h>