Staging: Add prima wlan driver

Import from motorola msm8226 kernel
https://github.com/CyanogenMod/android_kernel_motorola_msm8226
cfg80211: Add wiphy flag to disable 11D hints

Original commit:
https://github.com/CyanogenMod/android_kernel_motorola_msm8226/commit/da4d82de71d28ef1c78b4090f2feaba0c33a77f6
defconfig: Add prima/pronto config