tsnep: Use devm_platform_get_and_ioremap_resource() in tsnep_probe()

A wrapper function is available since the commit 890cc39a
("drivers: provide devm_platform_get_and_ioremap_resource()").
Thus reuse existing functionality instead of keeping duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Tested-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Link: https://lore.kernel.org/r/29e9dc0f-5597-4fee-be5c-25a5ab4fe2dc@web.de


Signed-off-by: Jakub Kicinski <kuba@kernel.org>