arm32: kaslr: Fix the bug of hidden symbols when decompressing code is compiled

hulk inclusion
category: bugfix
bugzilla: 47952
CVE: NA

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Fix the bug of hidden symbols when decompressing code is compiled,
we can't enable hidden cflags because decompressed code needs to
support symbol relocation.

Signed-off-by: Cui GaoSheng <cuigaosheng1@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>