riscv: make local symbols static

Symbols that are not exported should be declared as static.

Change-Id: Ie3bd17535c8cb2a0fec5d3bedfe7de3e0a702613
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7166
Tested-by: jenkins
Reviewed-by: Tim Newsome <tim@sifive.com>
Reviewed-by: Jan Matyas <matyas@codasip.com>

src/target/riscv/riscv-011.c

@@ -2297,7 +2297,7 @@ static int arch_state(struct target *target)
 	return ERROR_OK;
 }
 
-COMMAND_HELPER(riscv011_print_info, struct target *target)
+static COMMAND_HELPER(riscv011_print_info, struct target *target)
 {
 	/* Abstract description. */
 	riscv_print_info_line(CMD, "target", "memory.read_while_running8", 0);