mmc: octeontx_hsmmc.c: Remove test debug message

Remove a left-over debug test message from the Octeon TX / TX2
MMC driver.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Aaron Williams <awilliams@marvell.com>
Cc: Suneel Garapati <sgarapati@marvell.com>
Cc: Chandrakala Chavva <cchavva@marvell.com>