travis-ci: Re-work i.MX6 jobs, clarify Freescale and AArch64

- The catch-all i.MX6 job has been exceeding the time limit again so
  split this up further.  We now have an i.MX6 job and an
  everything-else job.
- The logic we use to say "Freescale and AArch64" can be more clearly
  expressed with '&' rather than excluding various other things, so
  clear that up.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.travis.yml b/.travis.yml
index 8333fae..aaa7433 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -135,10 +135,13 @@
           BUILDMAN="freescale -x powerpc,m68k,aarch64"
     - env:
         - JOB="Freescale AArch64"
-          BUILDMAN="freescale -x powerpc,m68k,armv7,arm9,arm11"
+          BUILDMAN="freescale&aarch64"
+    - env:
+        - JOB="i.MX6 (non-Freescale)"
+          BUILDMAN="mx6 -x freescale"
     - env:
-        - JOB="i.MX (non-Freescale)"
-          BUILDMAN="mx -x freescale"
+        - JOB="i.MX (non-Freescale, non-i.MX6)"
+          BUILDMAN="mx -x freescale,mx6"
     - env:
         - BUILDMAN="samsung"
     - env: