Fix #ifdef DDB/#ifdef SMALL_KERNEL uses so all four combinations (DDB/SMALL_KERNEL, DDB/!SMALL_KERNEL, !DDB/!SMALL_KERNEL, !DDB/SMALL_KERNEL) can compile. A DDB bsd.rd is thus possible again.
Fix #ifdef DDB/#ifdef SMALL_KERNEL uses so all four combinations
(DDB/SMALL_KERNEL, DDB/!SMALL_KERNEL, !DDB/!SMALL_KERNEL,
!DDB/SMALL_KERNEL) can compile. A DDB bsd.rd is thus possible again.

Correction to my original diff from miod@

"If it compiles, commit" deraadt@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars