radio: iris: Enable FM and add support for compat ioctls

Add support for compat ioctls to support 32-bit user space
applications with 64-bit kernel. Also, enabled FM iris
drivers config flags to compile and allow FM radio
functionality.

Change-Id: Id6cc7066e53e056761c595309198f310c5626a66
Signed-off-by: Satish Kodishala <skodisha@codeaurora.org>