msm-pm: Fix pc_debug_counter for 64bit kernel

Currently pc_debug_counter is 4 bytes value. On 64bit targets,
this is 8 bytes, causing it to print incorrect counter values.
Fix this counter to be long (4 bytes for 32bit/8 bytes for 64bit)
size.

Change-Id: Ife2596b4828e3c1210ba59cc8ea1924547d11d98
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>