Tegra: enable 'signed-comparison' compilation warning/errors

This patch enables the 'sign-compare' flag, to enable warning/errors
for comparisons between signed/unsigned variables. The warning has
been enabled for all the Tegra platforms, to start with.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/lib/cpus/errata_report.c b/lib/cpus/errata_report.c
index 4d9757e..1e1fc78 100644
--- a/lib/cpus/errata_report.c
+++ b/lib/cpus/errata_report.c
@@ -60,7 +60,7 @@
  * Applied: INFO
  * Not applied: VERBOSE
  */
-void errata_print_msg(int status, const char *cpu, const char *id)
+void errata_print_msg(unsigned int status, const char *cpu, const char *id)
 {
 	/* Errata status strings */
 	static const char *const errata_status_str[] = {