drivers: eth: gmac: fix IRQ names following import of latest HAL

Previous SAM E70 HAL version was patched by commit 4dcfc870 ("Add
missing interrupt number definitions") to add missing interrupt
definitions for SAM GMAC Priority Queues. This has been fixed in the
latest HAL by using a slightly different name. This patch updates the
driver accordingly.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>