Add chip-id support for Exynos850 SoC. Despite its "E3830" ID, the
actual SoC name is Exynos850 (Exynos3830 name is internal and outdated).

Format of Product_ID register in Exynos850 (offset 0x0):

     [31:0] Product ID (identification)

Format of CHIPID_REV register in Exynos850 (offset 0x10):

    [23:20] Main revision
    [19:16] Sub revision
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20211014133508.1210-3-semen.protsenko@linaro.orgSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>