Use gdbarch for most target parameters for the MN10300, rather

Use gdbarch for most target parameters for the MN10300, rather
than the tm-*.h file.
* config/mn10300/tm-mn10300.h (MAX_REGISTER_VIRTUAL_SIZE,
REGISTER_BYTES, FP_REGNUM, BREAKPOINT_FROM_PC,
FUNCTION_START_OFFSET, DECR_PC_AFTER_BREAK, INNER_THAN,
SAVED_PC_AFTER_CALL, INIT_EXTRA_FRAME_INFO, FRAME_INIT_SAVED_REGS,
FRAME_CHAIN, FRAME_CHAIN_VALID, FRAME_SAVED_PC,
EXTRACT_RETURN_VALUE, EXTRACT_STRUCT_VALUE_ADDRESS,
STORE_RETURN_VALUE, STORE_STRUCT_RETURN, SKIP_PROLOGUE,
FRAME_ARGS_SKIP, FRAME_ARGS_ADDRESS, FRAME_LOCALS_ADDRESS,
FRAME_NUM_ARGS, POP_FRAME, USE_GENERIC_DUMMY_FRAMES, CALL_DUMMY,
CALL_DUMMY_START_OFFSET, CALL_DUMMY_BREAKPOINT_OFFSET,
CALL_DUMMY_LOCATION, FIX_CALL_DUMMY, CALL_DUMMY_ADDRESS,
TARGET_READ_FP, PUSH_RETURN_ADDRESS, PUSH_DUMMY_FRAME,
SAVE_DUMMY_FRAME_TOS, PUSH_ARGUMENTS, PC_IN_CALL_DUMMY,
REG_STRUCT_HAS_ADDR, USE_STRUCT_CONVENTION, GET_SAVED_REGISTER):
Delete definitions.  We register gdbarch methods for these now.
(struct frame_info, struct type, struct value): Delete forward
declarations of these types; they're no longer necessary, since we
don't have function declarations here any more.
* mn10300-tdep.c: #include "arch-utils.h", to get declarations for
some default gdbarch methods.
(mn10300_store_struct_return): Return void, as expected by
gdbarch.
(mn10300_init_extra_frame_info): Take initial `fromleaf' argument,
as expected by gdbarch.
(mn10300_frame_init_saved_regs): Provide dummy definition for
this, as required by gdbarch.
(mn10300_gdbarch_init): Add mn10300_call_dummy_words, as expected
by gdbarch.  Register gdbarch methods or values for all the stuff
removed from tm-10300.h, listed above.