Revert "arm64: cpuinfo: print info for all CPUs"

Revert "arm64: cpuinfo: print info for all CPUs"

It turns out that vendors are relying on the format of /proc/cpuinfo,
and we've even spotted out-of-tree hacks attempting to make it look
identical to the format used by arch/arm/. That means we can't afford to
churn this interface in mainline, so revert the recent reformatting of
the file for arm64 pending discussions on the list to find out what
people actually want.

This reverts commit 180f6d3717b55ac286f4d2077b3a4201fcc2c3a9.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>