arm926ejs, at91: add common phy_reset function

arm926ejs, at91: add common phy_reset function

add common phy reset code into a common function.

Signed-off-by: Heiko Schocher <[email protected]>
Cc: Andreas Bießmann <[email protected]>
Cc: Bo Shen <[email protected]>
Cc: Jens Scharsig <[email protected]>
Cc: Sergey Lapin <[email protected]>
Cc: Stelian Pop <[email protected]>
Cc: Albin Tonnerre <[email protected]>
Cc: Eric Benard <[email protected]>
Cc: Markus Hubig <[email protected]>
Acked-by: Jens Scharsig (BuS Elektronik) <[email protected]>
Tested-by: Jens Scharsig (BuS Elektronik) <[email protected]>
Tested-by: Bo Shen <[email protected]>
Acked-by: Bo Shen <[email protected]>
Signed-off-by: Andreas Bießmann <[email protected]>