soc: qcom: smem: Rename "uncached" accessors

In preparation for adding accessors for "cached" entries rename the
"uncached" accessors to. Also rename "first" cached entry to "last", as
the cached list grows backwards.

Change-Id: I4f151806ea42c74fed581f1193effd22aef1bee3
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Patch-mainline: linux-arm-msm @ 14/08/17, 14:49
Signed-off-by: Chris Lew <clew@codeaurora.org>