staging: wfx: use kernel types instead of c99 ones

The kernel coding style promotes the use of kernel types (u8, u16, u32,
etc...) instead of the C99 ones.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200505123757.39506-16-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>