trace: ramdump: comment out not used functions

trace: ramdump: comment out not used functions

This patch comments out not used functions to remove following
warnings.

   drivers/trace/exynos-ss.c:593:21: warning: 'exynos_ss_get_core_panic_stat' defined but not used [-Wunused-function]
    static unsigned int exynos_ss_get_core_panic_stat(unsigned cpu)
                        ^
   drivers/trace/exynos-ss.c:1047:13: warning: 'exynos_ss_dump_task_info' defined but not used [-Wunused-function]
    static void exynos_ss_dump_task_info(void)
                ^

Change-Id: I267ad6128ea33ceb4cc476c0aa5aa0a6c4da6f95
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>