omap4: Add auto-generated irq and dma headers

These files are generated along with the HWMOD and will eventually be
in the existing header files as soon as all drivers will be migrate to
omap_hwmod / omap_device.

The dma-44xx.h file should be in 'arch/arm/mach-omap2/include/mach/',
but this would need dma.h header also present in the mach directory to
make local include possible, like what is done for irq.h. Then the
script is needed to modify the drivers to include 'mach/dma.h' instead
of 'plat/dma.h'. This would be a bigger change and hence left out for now

The v2 version fixes the checkpatch.pl warning of exceeding 80 char limit
by removing un-necessary comments appended in the end(The autogeneration
script has been updated accordingly).

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com>
Reviewed-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>