arm32: kaslr: Bugfix of initrd size calculation when enabled kaslr

hulk inclusion
category: bugfix
bugzilla: 185870 https://gitee.com/openeuler/kernel/issues/I4M8IW?from=project-issue


CVE: NA

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The maximum linear address is U32_MAX, when enabled kaslr,
A small value should be taken between end_addr of initrd and
U32_MAX when calculating the size of initrd.

Fixes: c1a0cdb5 ("ARM: decompressor: add KASLR support")
Signed-off-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Cui GaoSheng <cuigaosheng1@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>