staging: rtl8192e: adjust size of brfpath_rxenable for new RF90_PATH_MAX

staging: rtl8192e: adjust size of brfpath_rxenable for new RF90_PATH_MAX

The array brfpath_rxenable in struct r8192_priv is always accessed by
indices in the range i = 0; i < RF90_PATH_MAX. A previous patch changed the
value of RF90_PATH_MAX from 4 to 2, so we can reduce the size of
brfpath_rxenable to 2. Use RF90_PATH_MAX instead of a hard-coded size.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/20240831100809.29173-5-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>