arm: exynos: Enable CHIP ID clock

arm: exynos: Enable CHIP ID clock

The bootloader may gate the CLK_CHIPID_APBIF which will cause
an invalid value to be read for the Package ID in ASV. Explicitly
enable the clock in the ASV driver.

BUG=chrome-os-partner:16796
TEST=Boot 5 different snows to the login screen. Verify that the clock
is enabled and the appropriate speed group is being selected. Do a few
suspend/resume cycles with reboots.

Change-Id: Ib094b748301b7e882a50ae056bd9f0f795c133e5
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/39695