staging: rts5208: Refactor macros to static inline functions

staging: rts5208: Refactor macros to static inline functions

Driver rts5208 uses macros to read/write data & to perform generic PCI
functions. Rewrite these macros as static inline functions in the header
file.

Suggested-by: Dan Carpenter <dan.carpenter@linaro.org>
Suggested-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: Soumya Negi <soumya.negi97@gmail.com>
Link: https://lore.kernel.org/r/c7431fe4d7f72138d8dc86269794f87c30d21a38.1697152251.git.soumya.negi97@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>