Revert "net: micrel: fix KS8851_MLL Kconfig"

This reverts commit 1ff5359 which is
commit c3efced upstream.

The upstream commit c3efced ("net: micrel: fix KS8851_MLL Kconfig")
depends on e5f3155 ("ethernet: fix PTP_1588_CLOCK dependencies")
which is not part of Linux 5.10.y . Revert the aforementioned commit to
prevent breakage in 5.10.y .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: <stable@vger.kernel.org> # 5.10.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/micrel/Kconfig

@@ -37,7 +37,6 @@ config KS8851
 config KS8851_MLL
 	tristate "Micrel KS8851 MLL"
 	depends on HAS_IOMEM
-	depends on PTP_1588_CLOCK_OPTIONAL
 	select MII
 	select CRC32
 	select EEPROM_93CX6