Fix initramfs.conf paths

As this is run from the kernel source directory, assume we
have ../omap3-usb-boot-install available.
Add binary of usb-manager but don't use it yet

This allows charging the battery in initramfs.
Update WLAN firmware

Update to use version 14.66.35.p52:

http://git.marvell.com/?p=mwifiex-firmware.git;a=commit;h=3f45b8c4cc1eb1d102bc3486b19677332dd215ab
Updated initramfs with WLAN firmware and usb-manager

This is to allow manually starting usb-manager for charging
in initramfs for now.