mips: replace -mlong-calls with -mno-long-calls to make function calls faster in...

mips: replace -mlong-calls with -mno-long-calls to make function calls faster in kernel modules to achieve this, try to load kernel modules to KSEG0 and if that doesn't work, use vmalloc and fix up relocations with a jump table based on code from a kernel patch by MikroTik

SVN-Revision: 16772