greybus: build: Add -fno-pic for 32bit arm as well

In order for 32bit arm devices using the android toolchain
to load the greybus module, I need to add -fno-pic in the
build arguments as well.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>