radio: iris: Use #define to declare numerical constants

* Declaring these as actual types causes duplicate symbol problems
  when compiling IRIS as a kernel builtin.

Change-Id: Id180bc196caaa12d0755a9159af9660419558a56
m7 kernel: Add FM radio support

Build IRIS into the kernel for the m7

Change-Id: I38aaeed50e3b6fbba4da8854eba32d759bdb9acc
Update slim m7 defconfig

Change-Id: Idc4a5ed674a269b14813e5f5487bb1f6f8f533e5