MLK-13410 Android: Change to set mfgtool only for none android u-boot

The mfgtool environments only can set in BSP u-boot image, not for android
u-boot. Since android u-boot may go into fastboot in board_r phase which is
earlier than mfgtool environment check. The USB status from android fastboot
will cause u-boot to configure mfgtool environment.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 066f001a19bdc51b0fc0d65bcb87081b01f957c2)