net: phy: marvell10g: Use tabs instead of spaces for indentation

Some register definitions were defined with spaces used for indentation.
Change them to tabs.
Signed-off-by: NMarek Behún <kabel@kernel.org>
Reviewed-by: NRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>