mfd: db8500-prcmu: Remove dead code for a non-existing config

The config DBX500_PRCMU_QOS_POWER was never introduced in the kernel
repository. So, the ifdef in  ./include/linux/mfd/dbx500-prcmu.h was never
effective.

Remove these dead function prototypes.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211227064839.21405-1-lukas.bulwahn@gmail.com

include/linux/mfd/dbx500-prcmu.h

@@ -556,22 +556,6 @@ static inline void prcmu_clear(unsigned int reg, u32 bits)
 #define PRCMU_QOS_ARM_OPP 3
 #define PRCMU_QOS_DEFAULT_VALUE -1
 
-#ifdef CONFIG_DBX500_PRCMU_QOS_POWER
-
-unsigned long prcmu_qos_get_cpufreq_opp_delay(void);
-void prcmu_qos_set_cpufreq_opp_delay(unsigned long);
-void prcmu_qos_force_opp(int, s32);
-int prcmu_qos_requirement(int pm_qos_class);
-int prcmu_qos_add_requirement(int pm_qos_class, char *name, s32 value);
-int prcmu_qos_update_requirement(int pm_qos_class, char *name, s32 new_value);
-void prcmu_qos_remove_requirement(int pm_qos_class, char *name);
-int prcmu_qos_add_notifier(int prcmu_qos_class,
-			   struct notifier_block *notifier);
-int prcmu_qos_remove_notifier(int prcmu_qos_class,
-			      struct notifier_block *notifier);
-
-#else
-
 static inline unsigned long prcmu_qos_get_cpufreq_opp_delay(void)
 {
 	return 0;
@@ -613,6 +597,4 @@ static inline int prcmu_qos_remove_notifier(int prcmu_qos_class,
 	return 0;
 }
 
-#endif
-
 #endif /* __MACH_PRCMU_H */