petalinux.conf: Add CentOS-7.2.*and 7.3.* as supported distros
petalinux.conf: Add CentOS-7.2.*and 7.3.* as supported distros

When users ran bitbake on  machines running CentOS-7.2.1511, bitbake
complains saying:
"WARNING: Host distribution "CentOS-7.2.1511" has not been validated
with this version of the build system; you may possibly experience
unexpected failures. It is recommended that you use a tested
distribution."

Fix: Added CentOS-7.2.* and CentOS-7.3.* as tested distros.

Signed-off-by: Bhargava Sreekantappa Gayathri <376fad44dca59011c5129585e3eb1fe4cc84fdaa@xilinx.com>
Reviewed-by: Alistair Francis <52ecf00b70a50079ae8d5fa09b9af6904950b63c@xilinx.com>
Signed-off-by: Manjukumar Matha <4c64a17569570cb9f1048973bce031c402b55312@xilinx.com>

Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux