staging: rtl8192e: adjust size of rx_pwr for new RF90_PATH_MAX

staging: rtl8192e: adjust size of rx_pwr for new RF90_PATH_MAX

The local array rx_pwr in the function _rtl92e_query_rxphystatus() 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 rx_pwr 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/20240831100809.29173-3-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>