arm, hawkboard: Use the pinmux configurations defined in the arch tree

arm, hawkboard: Use the pinmux configurations defined in the arch tree

The boards in board/davinci/da8xxevm/ define pinmux_config[] vectors
that contain pinmux configurations for emac, uarts, memory controllers...
In an earlier patch such pinmux configurations were added to the arch
tree. This patch makes the hawkboard use these definitions instead of
defining its own.

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