spi: s3c64xx: simplify getting of_device_id match data

Use of_device_get_match_data() to make the code slightly smaller and to
remove the of_device_id table forward declaration.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Sylwester Nawrocki <snawrocki@kernel.org>
Link: https://lore.kernel.org/r/20210414203343.203119-1-krzysztof.kozlowski@canonical.com


Signed-off-by: Mark Brown <broonie@kernel.org>