arm, hawkboard: Remove obsolete struct pinmux_config i2c_pins

arm, hawkboard: Remove obsolete struct pinmux_config i2c_pins

The configuration in struct pinmux_config i2c_pins does not configure
the pins for i2c but for uart. Since this function is already
configured by struct pinmux_config uart2_pins the i2c_pins struct
is obsolete.

Signed-off-by: Christian Riesch <[email protected]>
Cc: Heiko Schocher <[email protected]>
Cc: Syed Mohammed Khasim <[email protected]>
Cc: Sughosh Ganu <[email protected]>
Cc: Sandeep Paulraj <[email protected]>
Acked-by: Heiko Schocher <[email protected]>