Remove external/jhead and hardware/ti/omap4*.

Bug: http://b/31428700
Change-Id: Id9f982a7b3fe72000a6b7236ee044b6d3bebf4be

default.xml

@@ -162,7 +162,6 @@
   <project path="external/jdiff" name="platform/external/jdiff" groups="pdk" />
   <project path="external/jemalloc" name="platform/external/jemalloc" groups="pdk" />
   <project path="external/jetty" name="platform/external/jetty" groups="pdk" />
-  <project path="external/jhead" name="platform/external/jhead" groups="pdk" />
   <project path="external/jline" name="platform/external/jline" groups="notdefault,tradefed,pdk-fs" />
   <project path="external/jmdns" name="platform/external/jmdns" groups="pdk" />
   <project path="external/jsilver" name="platform/external/jsilver" groups="pdk" />
@@ -388,8 +387,6 @@
   <project path="hardware/qcom/wlan" name="platform/hardware/qcom/wlan" groups="qcom_wlan,pdk" />
   <project path="hardware/ril" name="platform/hardware/ril" groups="pdk" />
   <project path="hardware/ti/omap3" name="platform/hardware/ti/omap3" groups="omap3,pdk" />
-  <project path="hardware/ti/omap4-aah" name="platform/hardware/ti/omap4-aah" groups="omap4-aah,pdk" />
-  <project path="hardware/ti/omap4xxx" name="platform/hardware/ti/omap4xxx" groups="omap4,pdk" />
   <project path="kernel/tests" name="kernel/tests" />
   <project path="libcore" name="platform/libcore" groups="pdk" />
   <project path="libnativehelper" name="platform/libnativehelper" groups="pdk" />