target/loongarch: Implement kvm get/set registers

Implement kvm_arch_get/set_registers interfaces, many regs
can be get/set in the function, such as core regs, csr regs,
fpu regs, mp state, etc.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: xianglai li <lixianglai@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Change-Id: Ia8fc48fe08b1768853f7729e77d37cdf270031e4
Message-Id: <20240105075804.1228596-5-zhaotianrui@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
diff --git a/meson.build b/meson.build
index 371edaf..b0dd87b 100644
--- a/meson.build
+++ b/meson.build
@@ -3329,6 +3329,7 @@
     'target/hppa',
     'target/i386',
     'target/i386/kvm',
+    'target/loongarch',
     'target/mips/tcg',
     'target/nios2',
     'target/ppc',