greybus: build: android: Fix script which locates .ko files and moves them into ramdisk

- Fixed incorrect use of $$GREYBUS_SRC_PATH variable
- Added quotes around find pattern to stop shell expansion of "*"

Signed-off-by: Michael Scott <michael.scott@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>