e6000sw: Write the value, not the register, in Clause 45 writesHEADmain

e6000sw_write_xmdio() loaded the Clause 45 register address into the
SMI PHY data register a second time, where the value to write belongs,
so every Clause 45 write stored the register address.

Its only caller, e6000sw_serdes_power(), runs at attach for ports 9 and
10 of the 88E6190 and 88E6190X to power one SERDES interface up and the
other down.  It wrote 0x2000 to the SGMII control register and 0x1000
to the 10GBASE-R PCS control register instead, so neither interface was
powered down and the rest of each register was overwritten.

Fixes:		9aba06377d26 ("Add support for the Marvell 88E6190 11 ports switch.")
Sponsored by:	Rubicon Communications, LLC ("Netgate")

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