csky: ftrace: Drop duplicate implementation of arch_check_ftrace_location()

The csky specific arch_check_ftrace_location() shadows a weak
implementation of the function in core code that offers the same
functionality but with additional error checking.

Drop the architecture specific function as a step towards further
cleanup in core code.

Link: https://lkml.kernel.org/r/163163034617.489837.7789033031868135258.stgit@devnote2

Signed-off-by: Punit Agrawal <[email protected]>
Acked-by: Guo Ren <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

Author: punitagrawal

arch/csky/kernel/probes/ftrace.c

@@ -2,13 +2,6 @@
 
 #include <linux/kprobes.h>
 
-int arch_check_ftrace_location(struct kprobe *p)
-{
-	if (ftrace_location((unsigned long)p->addr))
-		p->flags |= KPROBE_FLAG_FTRACE;
-	return 0;
-}
-
 /* Ftrace callback handler for kprobes -- called under preepmt disabled */
 void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 			   struct ftrace_ops *ops, struct ftrace_regs *fregs)