tests/functional: remove unused kernel_command_line

The Alpine test boots from the CDROM so we don't --append a command
line. Drop the unused code.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250108121054.1126164-22-alex.bennee@linaro.org>

tests/functional/test_aarch64_virt.py

@@ -41,8 +41,6 @@ def test_alpine_virt_tcg_gic_max(self):
 
         self.set_machine('virt')
         self.vm.set_console()
-        kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
-                               'console=ttyAMA0')
         self.require_accelerator("tcg")
 
         self.vm.add_args("-accel", "tcg")