find_mounted_volume_by_device() and remount_read_only() have no active
users. And we don't have a code logic that requires these two functions.

Test: mmma bootable/recovery
Test: Code search shows no user.
Change-Id: Ib11c2ba93ee087ea020c1337eb06686a6165f894

Bug: http://b/29250988
Change-Id: Ia97ba9082a165c37f74d6e1c3f71a367adc59945

Use of __inline__ by projects in bootable/* was causing problems with
clang. Following the BKM and replaced use of __inline__ with
__attribute((__gnu_inline)).

Change-Id: If4ccfded685bb2c9d9c23c9b92ee052208399ef0
Author: Edwin Vane <edwin.vane@intel.com>
Reviewed-by: Kevin P Schoedel <kevin.p.schoedel@intel.com>