Tegra194: SiP: Fix Rule 8.4 and Rule 10.4 violation

Rule 8.4, A compatible declaration shall be visible when an object
  or function with external linkage is defined.

Add function delaration to the header file.
Add suffix U to the unsigned constant define.

Change-Id: I54eba913a5fa38e4fdf3655931dc421d9510c691
Signed-off-by: Anthony Zhou <anzhou@nvidia.com>

plat/nvidia/tegra/soc/t194/drivers/include/mce_private.h

@@ -50,6 +50,9 @@ uint64_t nvg_get_cstate_stat_query_value(void);
 int32_t nvg_is_sc7_allowed(void);
 int32_t nvg_online_core(uint32_t core);
 int32_t nvg_update_ccplex_gsc(uint32_t gsc_idx);
+int32_t nvg_roc_clean_cache(void);
+int32_t nvg_roc_flush_cache(void);
+int32_t nvg_roc_clean_cache_trbits(void);
 int32_t nvg_enter_cstate(uint32_t state, uint32_t wake_time);
 
 void nvg_set_request_data(uint64_t req, uint64_t data);

plat/nvidia/tegra/soc/t194/plat_sip_calls.c

@@ -23,7 +23,7 @@ extern bool tegra_fake_system_suspend;
 /*******************************************************************************
  * Tegra186 SiP SMCs
  ******************************************************************************/
-#define TEGRA_SIP_ENABLE_FAKE_SYSTEM_SUSPEND		0xC2FFFE03
+#define TEGRA_SIP_ENABLE_FAKE_SYSTEM_SUSPEND		0xC2FFFE03U
 
 /*******************************************************************************
  * This function is responsible for handling all T186 SiP calls