omap4: Use irq line defines from irq-44xx.h

This patch removes all the omap4 specific irq line
defines from plat/irqs.h and includes auto-generated
irqs-44xx.h
All the legacy naming style defines are replaced with the one
from irqs-44xx.h

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com>
Reviewed-by: Paul Walmsley <paul@pwsan.com>
[tony@atomide.com: updated to compile with usb-musb.c]
Signed-off-by: Tony Lindgren <tony@atomide.com>