Make all section reads const

The way sections are read currently is unsafe in two ways, first,
buffers are completely unchecked for length, and section, buffers are
passed in as non-const void*.

Start fixing things by making the sections const.

Change-Id: I02e9ded525e9710b56589a47a9cc4f3583c216df
Signed-off-by: Ed Tanous <etanous@nvidia.com>
diff --git a/sections/cper-section-nvidia.c b/sections/cper-section-nvidia.c
index d5587c5..8b211ea 100644
--- a/sections/cper-section-nvidia.c
+++ b/sections/cper-section-nvidia.c
@@ -12,7 +12,7 @@
 #include <libcper/sections/cper-section-nvidia.h>
 
 //Converts a single NVIDIA CPER section into JSON IR.
-json_object *cper_section_nvidia_to_ir(void *section)
+json_object *cper_section_nvidia_to_ir(const void *section)
 {
 	EFI_NVIDIA_ERROR_DATA *nvidia_error = (EFI_NVIDIA_ERROR_DATA *)section;
 	json_object *section_ir = json_object_new_object();