irqchip: align irqchip OF match table section naming

Make the irqchip OF match table section naming aligned with other
OF match table sections in preparation to have a common definition.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rob Herring <robh@kernel.org>

diff --cc drivers/irqchip/irqchip.c
Simple merge

diff --cc include/asm-generic/vmlinux.lds.h
Simple merge