staging: r8188eu: ODM_MAC_EDCA_TURBO is always set

The ODM_MAC_EDCA_TURBO flag is always set for chips that are supported by
this driver. Remove the flag and the one place where it's checked.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220108124959.313215-2-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>