staging: r8188eu: remove unused efuse defines

This patch removes some unused defines, macros and include statements
related to efuses.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211125151436.5895-4-martin@kaiser.cx


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