powerpc/smp: Remove unused inline functions

commit 441c19c8 ("powerpc/kvm/book3s_hv: Rework the secondary
inhibit code") left behind this, so can remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210324140752.11320-1-yuehaibing@huawei.com

arch/powerpc/include/asm/smp.h

@@ -189,8 +189,6 @@ extern void __cpu_die(unsigned int cpu);
 #define smp_setup_cpu_maps()
 #define thread_group_shares_l2  0
 #define thread_group_shares_l3	0
-static inline void inhibit_secondary_onlining(void) {}
-static inline void uninhibit_secondary_onlining(void) {}
 static inline const struct cpumask *cpu_sibling_mask(int cpu)
 {
 	return cpumask_of(cpu);