arm64: errata: Don't define type field twice for arm64_errata[] entries

The ERRATA_MIDR_REV_RANGE macro assigns ARM64_CPUCAP_LOCAL_CPU_ERRATUM
to the '.type' field of the 'struct arm64_cpu_capabilities', so there's
no need to assign it explicitly as well.

Signed-off-by: Will Deacon <will.deacon@arm.com>