cpuinfo: add loongarch64 /proc/cpuinfo parsing
This pull request adds /proc/cpuinfo parsing support for LoongArch (loongarch64), as it uses a different /proc/cpuinfo format, a snippet as follows:
processor : 7
package : 0
core : 3
global_id : 7
CPU Family : Loongson-64bit
Model Name : Loongson-3A6000-HV
CPU Revision : 0x00
FPU Revision : 0x00
CPU MHz : 2500.00
BogoMIPS : 5000.00
TLB Entries : 2112
Address Sizes : 48 bits physical, 48 bits virtual
ISA : loongarch32 loongarch64
Features : cpucfg lam ual fpu lsx lasx crc32 lvz lbt_x86 lbt_arm lbt_mips
Hardware Watchpoint : yes, iwatch count: 8, dwatch count: 4
I have tested this with KInfoCenter, which shows the processor model correctly.