lantiq: fritz736x: Move GPIO resets to the inidvidual board.dts files

lantiq: fritz736x: Move GPIO resets to the inidvidual board.dts files

FRITZ!Box 7360 V2 and FRITZ!Box 7360 SL both use GPIOs 37 (for &phy0)
and GPIO 44 (for &phy1) to control the PHY's reset lines. FRITZ!Box 7362
SL however uses GPIO 45 (for &phy0) and GPIO 44 (for &phy1). Move the
GPIO reset definitions to each individual board .dts and while at it,
fix the GPIOs for the FRITZ!Box 7362 SL.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
(cherry picked from commit 56cd49bdc8ff762c52327ee7faa14cb99895e0fd)