imx7ulpevk.conf: Fix MACHINEOVERRIDES order
The exact manifestation that uncovered this problem was not recorded.
Generally speaking, a recipe misconfiguration was occurring due to an
incorrect variable value, caused by incorrectly choosing the _imx
override of the variable instead of the SOC override.
This is fixed by setting the SOC family and the SOC in MACHINEOVERRIDES
before including tune-cortexa7.inc.
Signed-off-by: Tom Hochstein <tom.hochstein@nxp.com>
(cherry picked from commit
9ba0cf3b74cf7884f9b1c1c44f92a96cb2a87525)