bblayers.conf: Replace OEROOT with TOPDIR
bblayers.conf: Replace OEROOT with TOPDIR

bitbake cannot parse it otherwise

Change-Id: Ibff4e3d2b461f1341668ee1369a00dc0a35335af
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

Angstrom-distribution/angstrom-manifest