Backport the new firmware_class from > 2.6.33 down to 2.6.23

Backport the new firmware_class from > 2.6.33 down to 2.6.23

My main concern with this backport was the usage of the
core driver "base.h" but as it turns out firmware_class doesn't
even need it. This allowed the backport to go through.

This new backport allows drivers which use the new modified firmware
API request_firmware_nowait() on older kernels. You should not
need to chagne the your request_firmware_nowait() calls at all;
the compat-2.6.32.h header ensures that your calls get mapped
to compat_request_firmware_nowait()

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>