staging: rts5208: Place constants on the right side of comparisons

Constants should be placed on the right hand side of comparisons. This
issue was identified by checkpatch.

Signed-off-by: Janani Ravichandran <janani.rvchndrn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>