Revert "libhwc2.1: remove the if defined guard for histogram"

This reverts commit 04178834b22eda6e2a5cd5a2d8759ef403cf94e3.

Reason for revert: b/312699412

Change-Id: I8b94e99467790af5d7e3ce1dac35d5be988c19b2
4 files changed