arm64: Kconfig: Make CONFIG_COMPAT_VDSO a proper Kconfig option

arm64: Kconfig: Make CONFIG_COMPAT_VDSO a proper Kconfig option

CONFIG_COMPAT_VDSO is defined by passing '-DCONFIG_COMPAT_VDSO' to the
compiler when the generic compat vDSO code is in use. It's much cleaner
and simpler to expose this as a proper Kconfig option (like x86 does),
so do that and remove the bodge.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
[bwh: Backported to 5.3: adjust context]

Gbp-Pq: Topic bugfix/arm64
Gbp-Pq: Name arm64-kconfig-make-config_compat_vdso-a-proper-kconf.patch