EXYNOS5250: be less chatty at critical moments

The 5250 DRAM code is *really* chatty. That's not a great
idea in time critical code, and DRAM init is generally
very sensitive about such things.

Finally, for those things that are errors, print them
at an error level, not a debug level.

Change-Id: Ifa86b019dfd5f8ae6c8a1da2a35b5d0808dc3623
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/60100
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Ronald G. Minnich <rminnich@chromium.org>
Tested-by: Ronald G. Minnich <rminnich@chromium.org>
Reviewed-on: http://review.coreboot.org/4359
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

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