ARM: defconfig: Enable USB EHSET driver for 9x07 host compliance

EHSET driver detects EHSET text fixture and puts downstream ports
in required Test Mode for electrical compliance testing in Host
mode.

Change-Id: I03aa0f2b53c17a3e687975b4c4ecadfad7cb25e7
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>