net: ibm: emac: mal: move irq maps down

Moves the handling right before they are used and allows merging a
branch.

Also get rid of the error handling as devm_request_irq can handle that.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20241030203727.6039-13-rosenp@gmail.com


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