net: stmmac: remove dwmac410_(enable|disable)_dma_irq

net: stmmac: remove dwmac410_(enable|disable)_dma_irq

As a result of the previous cleanup, it is now obvious that there are
no differences between the dwmac4 and dwmac410 versions of the DMA
interrupt enable/disable functions.

Moreover, dwmac410_disable_dma_irq() is completely unused; instead,
dwmac4_disable_dma_irq() is used to disable the interrupts for v4.10a
cores while dwmac410_enable_dma_irq() was being used to enable these
same same interrupts.

Remove the unnecessary v4.10a functions.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1vvuXT-0000000Avn9-29US@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>