ARM: mvebu: Enable SENSORS_PWM_FAN in defconfig

Now that the GPIO driver also supports PWM operation, enable the PWM
framework and fan driver in mvebu_v7_defconfig.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
URL: https://patchwork.ozlabs.org/patch/427297/


[Ralph Sennhauser: add fan driver to defconfig]
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>