Add support for loongarch cpu

[zhuyaliang]

Add loongarch support, the new architecture launched by China's Loongson. It can be compiled and run normally under loongarch architecture.
loongarch cpuinfo

[zhuyaliang]

test

[zyl@loongson lshw]$ ./src/lshw -c cpu
WARNING: you should run this program as super-user.
  *-cpu:0                   
       product: Loongson-3C5000
       physical id: 1
       bus info: cpu@0
       version: 0x11
       size: 2200MHz
       capabilities: cpucfg lam ual fpu lsx lasx crc32 complex crypto lvz lbt_x86 lbt_arm lbt_mips
  *-cpu:1
       product: Loongson-3C5000
       physical id: 2
       bus info: cpu@1
       version: 0x11
       size: 2200MHz
       capabilities: cpucfg lam ual fpu lsx lasx crc32 complex crypto lvz lbt_x86 lbt_arm lbt_mips
  *-cpu:2
       product: Loongson-3C5000
       physical id: 3
       bus info: cpu@2
       version: 0x11
       size: 2200MHz
       capabilities: cpucfg lam ual fpu lsx lasx crc32 complex crypto lvz lbt_x86 lbt_arm lbt_mips