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The HFPLL configuration recommended by the hardware designers has been
updated. Update acpuclock to match.

In addition to changes to the static register configuration, runtime
selection of the correct VCO mode is required. For frequencies above
1248MHz, the high-frequency VCO mode is used. The low-frequency mode
is used for frequencies below that.

Change-Id: Ib0585b5262d27791128a54910b75d2dc0c581775
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>