adm5120: avoid warning caused by wrong AMBA irq values

The amba core throws a warning if -1 is used as an
irq value since upstream commit:

  2eac58d5026e4ec8b17ff8b62877fea9e1d2f1b3
  ARM: amba: make use of -1 IRQs warn

  Make the core warn about the use of -1 (NO_IRQ)

Cange the value of the unused IRQs to zero for the
UART devices to get rid of the warning.

Based on #12729.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35747 3c298f89-4303-0410-b956-a3cf2f4a3e73
adm5120: remove a superfluous patch

The NO_IRQ symbol is not used by the amba core since
upstream commit:

  dfb85185bda373a70409c70c2632b02fb0f8f449
  AMBA: get rid of last two uses of NO_IRQ

  This gets rid of the last two users of NO_IRQ in AMBA primecell
  drivers.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35748 3c298f89-4303-0410-b956-a3cf2f4a3e73