ARM: dts: ti/omap: omap4-serial: fix interrupts syntax

ARM: dts: ti/omap: omap4-serial: fix interrupts syntax

Usually interrupts are overwritten in the board file to specify a
mux-dependent dedicated wakeup irq, so there is interrupts and
interrupts-extended property which is not allowed. That has generated a
lot of noise during dts changes if just a phandle involved has randomly
changed.

Avoid that mess by specifying interrupts-extended in the dtsi file.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reported-by: Rob Herring <robh@kernel.org>
Closes: https://lore.kernel.org/linux-omap/173558214240.2262575.18233884215338168789.robh@kernel.org/
Closes: https://lore.kernel.org/linux-omap/172784021601.525825.18405282128990798038.robh@kernel.org/
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20241230195556.112118-1-andreas@kemnade.info
Signed-off-by: Kevin Hilman <khilman@baylibre.com>