staging: vc04_services: bcm2835-audio: avoid the use of typedef for function pointers

Replace typedefs bcm2835_audio_newpcm_func and bcm2835_audio_newctl_func
with equivalent declarations to better align with the linux kernel
coding style.

Signed-off-by: Gaston Gonzalez <gascoar@gmail.com>
Link: https://lore.kernel.org/r/b53a77682994bbc3ccb9b89d617dec23d0785059.1640776340.git.gascoar@gmail.com


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