hwmon: (aspeed-pwm-tacho) Use devm_platform_ioremap_resource() in aspeed_pwm_tacho_probe()

Simplify this function implementation by using a known wrapper function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Link: https://lore.kernel.org/r/cd5bab7b-9333-2a43-bcf0-a47bbbe719eb@web.de


Signed-off-by: Guenter Roeck <linux@roeck-us.net>