tests/functional/riscv64: sifive_u: Fix kernel command line

Build the complete kernel command line before adding it to the QEMU
arguments. This ensures the panic, noreboot and rootwait options are
passed to the guest.

Fixes: 7db162fa01 ("tests/functional: Test SPI-SD adapter without SD card connected")
Signed-off-by: Bin Meng <bin.meng@processmission.com>

Reviewed-by: Chao Liu <chao.liu@processmission.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Message-ID: <20260713120245.781959-1-bin.meng@processmission.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

tests/functional/riscv64/test_sifive_u.py

@@ -35,9 +35,6 @@ def do_test_riscv64_sifive_u_mmc_spi(self, connect_card):
         kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
                                'earlycon=sbi console=ttySIF0 '
                                'root=/dev/mmcblk0 ')
-        self.vm.add_args('-kernel', kernel_path,
-                         '-append', kernel_command_line,
-                         '-no-reboot')
         if connect_card:
             kernel_command_line += 'panic=-1 noreboot rootwait '
             self.vm.add_args('-drive', f'file={rootfs_path},if=sd,format=raw')
@@ -46,6 +43,9 @@ def do_test_riscv64_sifive_u_mmc_spi(self, connect_card):
             kernel_command_line += 'panic=0 noreboot '
             pattern = 'Cannot open root device "mmcblk0" or unknown-block(0,0)'
 
+        self.vm.add_args('-kernel', kernel_path,
+                         '-append', kernel_command_line,
+                         '-no-reboot')
         self.vm.launch()
         self.wait_for_console_pattern(pattern)