octeontx2-af: cn10k: Fixes CN10K RPM reference issue

This patch fixes references to uninitialized variables and
debugfs entry name for CN10K platform and HW_TSO flag check.

Fixes: 3ad3f8f9

 ("octeontx2-af: cn10k: MAC internal loopback support").
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>

v1-v2
- Clear HW_TSO flag for 96xx B0 version.

This patch fixes the bug introduced by the commit
3ad3f8f9

 ("octeontx2-af: cn10k: MAC internal loopback support").
These changes are not yet merged into net branch, hence submitting
to net-next.

Signed-off-by: David S. Miller <davem@davemloft.net>