commit fbcd0412c7d5c68a66363fae4f8d5684be1923e5
author Bowgo Tsai <bowgotsai@google.com> Tue Jun 20 17:38:21 2017 +0800
committer Bowgo Tsai <bowgotsai@google.com> Wed Jun 21 10:22:59 2017 +0800
tree 20f487baf0266ce39d7efb3ee6e0242db15cae53
parent f636a8088830e8e9f31758de81690b8f90c49b52

Use make functions to convert a text to lower case

We cannot cache the result of ($shell ...) and we have to run these on
every build even if we don't have to re-read the makefiles. Replace it
with make functions $(substr $(substr ... )).

Bug: 38399657
Test: `make` pass, flash images from $OUT and boot device with chain partitions
Merged-In: I6d4ff8e487931ba25008a2a881401a8951d4049e
Change-Id: I6d4ff8e487931ba25008a2a881401a8951d4049e
(cherry picked from commit e615afd6d05d4b1ee6c30015769d8e60905617b9)