ptpd: 2.3.1-rc2->2.3.1

Delete ptpd-add-dpaa-etsec-support.patch.The reason is the following:
- The ptpd-add-dpaa-etsec-support.patch does not suitable for new version.
- The upstream didn't accept this patch.

Signed-off-by: Lei Maohui <leimaohui@cn.fujitsu.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>