tests/qtest/migration: Fix compile errors when CONFIG_UADK is set

tests/qtest/migration: Fix compile errors when CONFIG_UADK is set

Removes accidental inclusion of unrelated functions within CONFIG_UADK
as this causes compile errors like:

error: redefinition of ‘migrate_hook_start_xbzrle’

Fixes: 932f74f3fe6e ("tests/qtest/migration: Split compression tests from migration-test.c")
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Message-Id: <20241217131046.83844-1-shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>