RISC-V: Avoid updating state until symbol is found

Currently objdump gets and updates the map state once per symbol. Updating the
state (partiularly riscv_parse_subset) is expensive and grows quadratically
since we iterate over all symbols. By deferring this until once we've found the
symbol of interest, we can reduce the time to dump a 4k insn file of .norvc and
.rvc insns from ~47 seconds to ~0.13 seconds.

opcodes/ChangeLog:

	* riscv-dis.c (riscv_get_map_state): Remove state updating logic
	and rename to riscv_is_valid_mapping_symbol.
	(riscv_update_map_state): Add state updating logic to seperate function.
	(riscv_search_mapping_symbol): Use new riscv_update_map_state.
	(riscv_data_length): Ditto.

Signed-off-by: Patrick O'Neill <patrick@rivosinc.com>

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