cpuidle: menu: Remove the unused get_loadavg function

The fuction get_loadavg was unused and this also caused
a warning during build. This change also removes it from
the allowed warnings white-list.

Change-Id: I85b184e1eb0ab8b3cf763cab87a30e140d00332b
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>

scripts/gcc-wrapper.py

@@ -54,7 +54,6 @@ allowed_warnings = set([
     "inode.c:72",
     "inode.c:73",
     "inode.c:74",
-    "menu.c:128",
     "msm_sdcc.c:126",
     "msm_sdcc.c:128",
     "nf_conntrack_netlink.c:790",