Arm: Use read_description funcs in gdbserver

Arm: Use read_description funcs in gdbserver

Switch gdbserver over to using feature target descriptions.

Add a function for determining the type of a given target description,
and use where required.

gdb/gdbserver/ChangeLog:

	* configure.srv: Add new files. Remove xml generated files.
	* linux-aarch32-low.c (initialize_low_arch_aarch32): Don't init
	registers.
	* linux-aarch32-low.h (tdesc_arm_with_neon): Remove.
	* linux-aarch32-tdesc.c: New file.
	* linux-aarch32-tdesc.h: New file.
	* linux-aarch64-low.c (aarch64_arch_setup): Call aarch32_linux_read_description.
	* linux-arm-low.c (init_registers_arm, tdesc_arm)
	(init_registers_arm_with_iwmmxt, tdesc_arm_with_iwmmxt)
	(init_registers_arm_with_vfpv2, tdesc_arm_with_vfpv2)
	(init_registers_arm_with_vfpv3, tdesc_arm_with_vfpv3): Remove.
	(arm_fill_wmmxregset, arm_store_wmmxregset, arm_fill_vfpregset)
	(arm_store_vfpregset): Call arm_linux_get_tdesc_fp_type.
	(arm_read_description): Call arm_linux_read_description.
	(initialize_low_arch): Don't init registers.
	* linux-arm-tdesc.c: New file.
	* linux-arm-tdesc.h: New file.