edk2-pytool-library: Add LoongArch64 host architecture support

The current GetHostInfo() does not recognize 'loongarch64' returned by
platform.machine(). This causes stuart_setup and other edk2 tools to fail
on LoongArch systems.

This patch adds basic detection for LoongArch64 and treats it as a 64-bit
ARM-like architecture, which allows edk2 Python tools to run on LoongArch.

Signed-off-by: Dongyan Qian <qiandongyan@loongson.cn>

Author: MarsDoge

edk2toollib/utility_functions.py

@@ -109,6 +109,8 @@ def GetHostInfo() -> namedtuple:
         arch = "x86"
     elif ("ARM" in processor_info.upper()) or ("AARCH" in processor_info.upper()):
         arch = "ARM"
+    elif ("LOONGARCH" in processor_info.upper()):
+        arch = "LOONGARCH"
 
     if "32" in processor_info:
         bit = "32"