USB: gadget: Kconfig: Change Max VBUS power usage default value

Currently the VBUS Max power usage is set to default value of 2.
Change this value to default of 500 to honour the code that uses
CONFIG_USB_GADGET_VBUS_DRAW to set the bMaxPower.

Change-Id: If27b422c23ad2a010744f9660cc0b376d02649df
Signed-off-by: Chiranjeevi Velempati <cvelempa@codeaurora.org>
scripts/Kbuild.include: Fix portability problem of "echo -e"

"echo -e" is a GNU extension. When cross-compiling the kernel on a
BSD-like operating system (Mac OS X in my case), this doesn't work.

One could install a GNU version of echo, put that in the $PATH before
the system echo and use "/usr/bin/env echo", but the solution with
printf is simpler.

Since it is no disadvantage on Linux, I hope that gets accepted even if
cross-compiling the Linux kernel on another Unix operating system is
quite a rare use case.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>
Andreas Bießmann <andreas@biessmann.de>
Signed-off-by: Michal Marek <mmarek@suse.cz>

Change-Id: I6bf4c4ad3aedf880749ccdff738c951ab579cb27