hw/loongarch/virt: Fix virt_to_phys_addr function

The virt addr should mask TARGET_PHYS_ADDR_SPACE_BITS to
get the phys addr, and this is used by loading kernel elf.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230327112313.3042829-1-zhaotianrui@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

hw/loongarch/virt.c

@@ -399,7 +399,7 @@ static struct _loaderparams {
 
 static uint64_t cpu_loongarch_virt_to_phys(void *opaque, uint64_t addr)
 {
-    return addr & 0x1fffffffll;
+    return addr & MAKE_64BIT_MASK(0, TARGET_PHYS_ADDR_SPACE_BITS);
 }
 
 static int64_t load_kernel_info(void)