Merged in masayuki2009/nuttx.nuttx/lc823450_autoled (pull request #532)

lc823450 auto LED support

* arch/arm/src/lc823450: Add auto LED for CPU activity

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

* configs/lc823450-xgevk: Add auto LED support

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Approved-by: Gregory Nutt <gnutt@nuttx.org>