Platform/Ampere: Fix build break in JadePkg

The definition for ARM_PROCESSOR_TABLE has been removed by
commit c8af26627a4e9a3659255dc147d75596da08248e
as it is a pseudo ACPI table.

This causes the JadePkg builds to fail. Therefore, update
Ampere/JadePkg to reflect this change.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>