RPM: Add /opt/rocm/lib64 to lib path

CentOS+cmake suffix the "lib" folder with 64 when building 64-bit
packages

Fixes: 146d8ec61b: Clean up cmake install and package



Change-Id: If029afd6e198b812116f3d3b3921b5486a1be355


[ROCm/ROCR-Runtime commit: 3719ec2557]

projects/rocr-runtime/RPM/rpm_post

@@ -1 +1 @@
-echo /opt/rocm/lib > /etc/ld.so.conf.d/x86_64-libhsakmt.conf && ldconfig
+echo -e "/opt/rocm/lib\n/opt/rocm/lib64" > /etc/ld.so.conf.d/x86_64-libhsakmt.conf && ldconfig