The serial TX IRQ is not simply (RX IRQ + 1) on some Blackfin chips,
so move the values to the platform resources.
Signed-off-by: NSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
Signed-off-by: NBob Liu <lliubbo@gmail.com>