Remove unnecessary executable bit on source files

This was causing the presubmit to error.

TEST=Build with `cros_workon_make`
BUG=none

Change-Id: I38a30256aef6481cc300d4dddb6c48dca5e8396c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/libevdev/+/1978149
Tested-by: Harry Cutts <hcutts@chromium.org>
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Harry Cutts <hcutts@chromium.org>
diff --git a/include/libevdev/libevdev_event.h b/include/libevdev/libevdev_event.h
old mode 100755
new mode 100644
diff --git a/include/module.mk b/include/module.mk
old mode 100755
new mode 100644
diff --git a/src/libevdev_event.c b/src/libevdev_event.c
old mode 100755
new mode 100644
diff --git a/src/module.mk b/src/module.mk
old mode 100755
new mode 100644