nyx-modules: Fix syntax

:Release Notes:
DEPENDS_${PN} doesn't exist as variable in OE world and is ignored by
bitbake. Override together with '+=' is almost always error, fix
nyx-modules.bbappend SRC_URI.

:Detailed Notes:

:Testing Performed:
Only build tested.

:QA Notes:
Fixes nyx-modules build.

:Issues Addressed:
[ES-1107] Fix metadata issues in bsp layers
[ES-1137] CCC: Fix metadata issues in bsp layers

Change-Id: I6179d45abe249b89e3ebbc582c4dfaabd0e40d32
Originally-reviewed-on: https://gpro.palm.com/57233
Reviewed-on: https://g2g.palm.com/6343
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>