Add target_ops argument to to_remove_hw_breakpoint

Add target_ops argument to to_remove_hw_breakpoint

2014-02-19  Tom Tromey  <tromey@redhat.com>

	* target.h (struct target_ops) <to_remove_hw_breakpoint>: Add
	argument.
	(target_remove_hw_breakpoint): Add argument.
	* target.c (debug_to_remove_hw_breakpoint): Add argument.
	(update_current_target): Update.
	* remote.c (remote_remove_hw_breakpoint): Add 'self' argument.
	* ppc-linux-nat.c (ppc_linux_remove_hw_breakpoint): Add 'self'
	argument.
	* i386-nat.c (i386_remove_hw_breakpoint): Add 'self' argument.
	* arm-linux-nat.c (arm_linux_remove_hw_breakpoint): Add 'self'
	argument.
	* aarch64-linux-nat.c (aarch64_linux_remove_hw_breakpoint): Add
	'self' argument.