arm64: module: Remove unused plt_entry_is_initialized()

Since commit f1a54ae9 ("arm64: module/ftrace: intialize PLT at load
time"), plt_entry_is_initialized() is unused anymore , so remove it.
Signed-off-by: NLi Huafei <lihuafei1@huawei.com>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20220929094134.99512-3-lihuafei1@huawei.comSigned-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/module.h

@@ -59,9 +59,4 @@ static inline bool is_forbidden_offset_for_adrp(void *place)
 
 struct plt_entry get_plt_entry(u64 dst, void *pc);
 
-static inline bool plt_entry_is_initialized(const struct plt_entry *e)
-{
-	return e->adrp || e->add || e->br;
-}
-
 #endif /* __ASM_MODULE_H */