Cleanup for ELF trampoline code.

[Jayachandran C.]

I've attached a patch which cleans up sys/conf/Makefile.mips a bit,
the changes are:
- don't use -shared flag for the trampoline binary, now we generate a
shared obj, elf executable would be a better choice.
- don't generate tmphack.S,  move the code to sys/mips/mips/inckern.S
- don't generate opt_kernname.h, pass KERNNAME with -D

Please let me know your comments. I'm not sure which other platforms
use the elf trampoline code, let me know if this will break any
platform.

Thanks,
JC
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