ARM: kernel: make vmlinux buildable as a PIE executable

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8KNA9
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?h=arm-kaslr-latest&id=04be01192973461cdd00ab47908a78f0e2f55ef8



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Update the Kconfig RELOCATABLE depends on !JUMP_LABEL to resolve
compilation conflicts between fpic and JUMP_LABEL

Update the build flags and linker script to allow vmlinux to be built
as a PIE  binary, which retains relocation information about absolute
symbol references so that they can be fixed up at runtime. This will
be used for implementing KASLR,

Cc: Russell King <linux@armlinux.org.uk>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

Conflicts:
    Merge OLK-5.10 fix patch 6bc05b0a
    Merge OLK-5.10 fix patch 6a95a311

Signed-off-by: Felix Fu <fuzhen5@huawei.com>