msm: acpuclock-krait: Mark hfpll_init() as __cpuinit

hfpll_init() may be called from the hotplug path if a CPU is
first brought online after the kernel has booted. Correct
the section annotation so this is safe.

Change-Id: I75d3ef73b8e711f648a2e2f3bed47c485f5a3579
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>