USB: f_mtp: Remove existing duplicate code

autoconfig of out endpoint is being done twice for mtp driver.
Hence, removing the duplicate code of autoconfig of out endpoint.

CRs-Fixed: 339985
Change-Id: I677462999d0bcc1387aafe4c068e09fda5df15f6
Signed-off-by: Chiranjeevi Velempati <cvelempa@codeaurora.org>
(cherry picked from commit 5e27b7675695c82b8fd61565950863567e5c0628)
fix warnings with gcc >=4.8