staging: vchiq_2835_arm: drop enum vchiq_status

Replace the custom set of return values with proper Linux error codes.
As a result we need to initialize vchiq_status in vchiq_init_state.

Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1619347863-16080-8-git-send-email-stefan.wahren@i2se.com


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