Use platform_get_irq to get irq number

In kernel 6.x versions using platform_get_resource() to get the irq
resource is not supported and it returns -ENOENT. Use platform_get_irq
to ger irq number. Also get irq trigger type to update irq flags. This
works in both 5.x and 6.x versions.

Change-Id: I0c04c1179621b70c66659a6d2777ff24429fa866
Signed-off-by: Rajasekaran Kalidoss <rajasekaran.kalidoss@arm.com>