Remove IRQ configuration from U-Boot PP driver.
U-Boot don't use interrupts and configuration of IRQ in U-Boot
caused crashes in Linux shared interrupt mode.
Also interrupt use is redundant in RX routine since a single RX
queue is used.
Signed-off-by: Stefan Chulski <stefanc@marvell.com> Tested-by: iSoC Platform CI <ykjenk@marvell.com> Reviewed-by: Nadav Haklai <nadavh@marvell.com> Reviewed-by: Igal Liberman <igall@marvell.com> Acked-by: Joe Hershberger <joe.hershberger@ni.com> Signed-off-by: Stefan Roese <sr@denx.de>