ASoC: spear: Convert to use devm_ioremap_resource

Commit 75096579 ("lib: devres: Introduce devm_ioremap_resource()")
introduced devm_ioremap_resource() and deprecated the use of
devm_request_and_ioremap().

devm_request_mem_region is called in devm_ioremap_resource(). Hence that
part can also be removed.

Since devm_ioremap_resource prints error message on failure, there is
no need to print an explicit warning message.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
CC: alsa-devel@alsa-project.org
CC: Liam Girdwood <lgirdwood@gmail.com>
CC: Mark Brown <broonie@kernel.org>
Signed-off-by: Mark Brown <broonie@linaro.org>