This reverts commit cc5ad09caabd31b1efe02fb80cf811f698d9ac63.
apps/examples/i2sloop: Add i2sloop application This application can be used to test I2S loopback nsh> i2sloop & Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com> Approved-by: Gregory Nutt <gnutt@nuttx.org>