ion: change ion buffer flags

This syncs up our ion buffer flags in ion.h with upstream (using
ION_FLAG_CACHED instead of CACHED and UNCACHED).

Change-Id: I2e07a3acba230a86817182677fa2394fa846fd7e
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
3 files changed