ANDROID: MMC/UFS IO Latency Histograms.

This patch adds a new sysfs node (latency_hist) and reports
IO (svc time) latency histograms. Disabled by default, can be
enabled by echoing 0 into latency_hist, stats can be cleared
by writing 2 into latency_hist. This commit fixes the 32 bit
build breakage in the previous commit. Tested on both 32 bit
and 64 bit arm devices. (Merged from android4.4-common).

Bug: 30677035
Change-Id: I9403ea093f4cd54ebae08f12a11d01ef153118d0
Signed-off-by: Mohan Srinivasan <srmohan@google.com>