ARM: tegra: cpuidle: using IS_ENABLED for multi SoCs management in init func

Clean up the Tegra CPUidle init function by using IS_ENABLED for multi
SoCs management in the init function.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/mach-tegra/cpuidle.c

@@ -31,15 +31,16 @@ void __init tegra_cpuidle_init(void)
 {
 	switch (tegra_chip_id) {
 	case TEGRA20:
-		tegra20_cpuidle_init();
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
+			tegra20_cpuidle_init();
 		break;
 	case TEGRA30:
-		tegra30_cpuidle_init();
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
+			tegra30_cpuidle_init();
 		break;
 	case TEGRA114:
-		tegra114_cpuidle_init();
-		break;
-	default:
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC))
+			tegra114_cpuidle_init();
 		break;
 	}
 }

arch/arm/mach-tegra/cpuidle.h

@@ -17,25 +17,10 @@
 #ifndef __MACH_TEGRA_CPUIDLE_H
 #define __MACH_TEGRA_CPUIDLE_H
 
-#ifdef CONFIG_ARCH_TEGRA_2x_SOC
+#ifdef CONFIG_CPU_IDLE
 int tegra20_cpuidle_init(void);
-#else
-static inline int tegra20_cpuidle_init(void) { return -ENODEV; }
-#endif
-
-#ifdef CONFIG_ARCH_TEGRA_3x_SOC
 int tegra30_cpuidle_init(void);
-#else
-static inline int tegra30_cpuidle_init(void) { return -ENODEV; }
-#endif
-
-#ifdef CONFIG_ARCH_TEGRA_114_SOC
 int tegra114_cpuidle_init(void);
-#else
-static inline int tegra114_cpuidle_init(void) { return -ENODEV; }
-#endif
-
-#ifdef CONFIG_CPU_IDLE
 void tegra_cpuidle_init(void);
 #else
 static inline void tegra_cpuidle_init(void) {}