target: Use 'bool' data type in target_{step,resume}

While at it, adapt data types of related functions and fix some coding
style issues.

Change-Id: I74db9258fc17b1ee8aa446f35ae722ea7c2f67e6
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/8524
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

src/target/riscv/riscv.h

@@ -294,9 +294,9 @@ int riscv_halt(struct target *target);
 
 int riscv_openocd_step(
 	struct target *target,
-	int current,
+	bool current,
 	target_addr_t address,
-	int handle_breakpoints
+	bool handle_breakpoints
 );
 
 int riscv_openocd_assert_reset(struct target *target);