msm-4.14: Fix build error

"python2" is not allowed to be used.

See https://android.googlesource.com/platform/build/+/master/Changes.md#PATH_Tools


for more information.

Change-Id: I5c89d2b955a918fa0cfe1a5358dbb9eb42ac5b3f
Signed-off-by: Bruce Levy <blevy@codeaurora.org>