ub: change default Kconfig to n, and depends on arm64

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I87OZH


CVE: NA

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Change kconfig of urma to default close.
And only support compiling on aarch64

Signed-off-by: Guoxin Qian <qianguoxin@huawei.com>
Signed-off-by: Yizhen Fan <fanyizhen@huawei.com>