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-pci-dev.c b/sections/cper-section-pci-dev.c
index 8dc899b..adc54a0 100644
--- a/sections/cper-section-pci-dev.c
+++ b/sections/cper-section-pci-dev.c
@@ -11,7 +11,7 @@
 #include <libcper/sections/cper-section-pci-dev.h>
 
 //Converts a single PCI/PCI-X device CPER section into JSON IR.
-json_object *cper_section_pci_dev_to_ir(void *section)
+json_object *cper_section_pci_dev_to_ir(const void *section)
 {
 	EFI_PCI_PCIX_DEVICE_ERROR_DATA *dev_error =
 		(EFI_PCI_PCIX_DEVICE_ERROR_DATA *)section;