defconfig: apq8084: Add apq8084-perf_defconfig

Add a new kernel configuration file for APQ8084 with a
focus on performance and minimum debugging options enabled.

Change-Id: I6cb53b6bec85b8f36b4b241f39f073f89744ace9
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>