net: phy: broadcom: Fix PHY_BRCM_IDDQ_SUSPEND definition

An extraneous number was added during the inclusion of that change,
correct that such that we use a single bit as is expected by the PHY
driver.

Reported-by: Justin Chen <justinpopo6@gmail.com>
Fixes: d6da08ed

 ("net: phy: broadcom: Add IDDQ-SR mode")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>