cpufreq: cpu-boost: Make the code 64 bit compatible

As the pointers' size change to 64 bits in the 64 bit kernel, the
int declarations for them from the legacy code give compilation
warnings which get flagged as errors.
Replace int casting of pointers with long to get rid of these
warnings.

Change-Id: I96b6cf342c2bf110220eac0addfb72fbdd969c6e
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>