Add CONFIG_HW_RANDOM_ZHAOXIN in openeuler_defconfig

zhaoxin inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8WXB4


CVE: NA

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The patch adds the zhaoxin rng driver and modifies the corresponding
Makefile and Kconfig. Therefore, CONFIG_HW_RANDOM_ZHAOXIN is added to
openeuler_defconfig, and it is set to "m" by default.

Signed-off-by: leoliu-oc <leoliu-oc@zhaoxin.com>