Previously Loongson 1B and Loongson 1C have their own libcpu
implemention, but they're almost identical. So we merge them
into gs232 and adapt to new common code.
Signed-off-by: NJiaxun Yang <jiaxun.yang@flygoat.com>

MIPS common code was highly duplicated, This commit
is a attempt to clean-up and refine these code.

The context and exception handle flow is mostly identical
with Linux, but a notable difference is that when FPU enabled,
we save FP registers in stackframe unconditionally.
Signed-off-by: NJiaxun Yang <jiaxun.yang@flygoat.com>

更新版权信息。

Update copyright information.
Signed-off-by: NZhou Yanjie <zhouyanjie@zoho.com>

清理内容重复的头文件。

Clean up duplicate header files.
Signed-off-by: NZhou Yanjie <zhouyanjie@zoho.com>

1、添加自引导特性，添加配置选项
2、修复cpuport.c的bug
3、修复ls1c_pin.c不能默认复用的bug

浮点经常会用到，所以默认使用硬浮点。