In anticipation of PMU support for Realview boards, the IRQs defined
for some of these boards need updating.

This patch removes incorrect L220 IRQ definitions, corrects incorrect PMU
IRQs and adds any missing IRQs that are required.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>