meta-agl-bsp: kernel: remove linux-boundary defconfig from meta-freescale-layer.

Its do not needed anymore here, because we started to using meta-boundary layer

Bug-AGL: SPEC-905

Change-Id: I179ac8747fe24293be89d3138f54589511ed2b63
Signed-off-by: Mihail Grigorov <michael.grigorov@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/11749
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Thomas Rini <trini@konsulko.com>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>