staging: r8188eu: set firmware path in a macro

The r8188eu driver requires a firmware file, the path of which was
hardcoded as constant strings in two places:
(1) in core/rtw_fw.c, in function load_firmware(),
(2) in os_dep/os_intfs.c, in the MODULE_FIRMWARE() call.

Declare the path using a macro, FW_RTL8188EU, and replace the above
constant strings with the macro. That's the way it is done in many other
drivers. The new macro is defined in include/drv_types.h, because that
file is already included by both of the above files (or at least their
headers) and because it already contains other driver constants, like
its name and version.

Link: https://lore.kernel.org/lkml/[email protected]/
Suggested-by: Greg Kroah-Hartman <[email protected]>
Tested-by: Philipp Hortmann <[email protected]> # Edimax N150
Signed-off-by: Grzegorz Szymaszek <[email protected]>
Link: https://lore.kernel.org/r/60dc57fc73e8e6e8e3aaae68784f4be932547bf5.1659715931.git.gszymaszek@short.pl
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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