staging: r8188eu: rtl8188e_EFUSE_GetEfuseDefinition is unused

Now that we use the map length directly, rtl8188e_EFUSE_GetEfuseDefinition
is no longer needed and can be removed.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211113185518.23941-10-martin@kaiser.cx


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