msm: acpuclock-krait: Add __init markings to 'krait vmin' functions

These functions are only called during boot and can be safely
discarded after.

Change-Id: I6bf20a42fec8b82c3f35e1c042b799ef2dad7790
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
msm: acpuclock-krait: Enable HFPLL for init only if switching to it

The existing code left the HFPLL enabled in hfpll_init(), even if
the CPU was detected to be at a non-HFPLL rate. Correct this for
power savings between when hfpll_init() and the first runtime CPU
frequency switch happen. This also ensure votes for HFPLL
regulators are not left unnecessarily asserted.

Change-Id: Iaca5dc7e4769bdbd494d669726ba9b500256f793
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>