staging: r8188eu: use efuse map length define directly

The length of the efuse data section is constant. We can use the
corresponding define directly, there's no need to get the length
from rtl8188e_EFUSE_GetEfuseDefinition.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211113185518.23941-9-martin@kaiser.cx


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