arm64: errata: Enable #845719 Errataum for Kryo2xx Silver

Errata#845719 is also applicable for Kryo2xx Silver. Enable
the appropriate entry for it with rAp4 revision.

Please note that default midr_range logic depends on the
less or greather than logic with "min" and "max" range,
assuming that rX where X will be zero only. This is not
true for all the processors and since it is 4-bit field
it can be greater than the the "max" or pY bits.

We are specifying the direct match values like
0xA00004 instead here to keep the logic consistent.

Change-Id: I16b0c2106ae649b8a23b7ebb534c967aebd72774
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>