The current find_bblayers() code finds and parses the BBLAYERS
variable manually, and therefore doesn't handle variable substitution,
which causes problems if used.
This change makes find_bblayers() use the variable-substituted
BBLAYERS instead.
Fixes [YOCTO #5106]
(From meta-yocto rev: 1629ac04e909143dc2c275c256094cb44c6cc43c)
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>