staging: rtl8192e: Remove zeroed arrays tx_pwr_level_cck_a and friends

staging: rtl8192e: Remove zeroed arrays tx_pwr_level_cck_a and friends

The arrays tx_pwr_level_cck_a, tx_pwr_level_ofdm_24g_a,
tx_pwr_level_cck_c and tx_pwr_level_ofdm_24g_c are initialized to zero
and never changed. Delete the upper named arrays and set the variables
directly to zero to avoid useless code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/b88e6bdd5569ac651692074060fba6f79c68c687.1674244819.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>