[build] Update zephyr to aca079

Sudarsana Nagineni · Jimmy Huang · commit 4324cf215b8b · 2018-02-01T14:36:27.000-08:00
Update zephyr to get USB OTG support for
olimex stm32-e407, stm32f407g_disc1 boards.

Signed-off-by: Sudarsana Nagineni &lt;sudarsana.nagineni@intel.com&gt;
diff --git a/deps/zephyr b/deps/zephyr
@@ -1 +1 @@
-Subproject commit 7e317dbc4bb9160d2475a91359fa8ffdb2e0e41f
+Subproject commit aca079c9fcd603cd5317a763fa21732a1a806d1b
