staging: vc04_services: Drop VCHIQ_RETRY usage

Drop the usage of VCHIQ_RETRY vchiq_status enum type in most of the
places and replace it with -EAGAIN. The exception to this replacement
is vchiq_send_remote_use() and vchiq_send_remote_use_active() which will
be addressed in the subsequent commit.

This patch acts as intermediatory to address the TODO item:
    * Get rid of custom function return values
for vc04_services/interface.

Signed-off-by: Umang Jain <[email protected]>
Tested-by: Stefan Wahren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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