mfd: omap-usb-tll: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Link: https://lore.kernel.org/r/20230706113939.1178-2-frank.li@vivo.com


Signed-off-by: Lee Jones <lee@kernel.org>