Revert "ARM: davinci: da850: Manual pinmux only when PINCTRL not available"

This reverts commit 877ab242.

The above patch was designed to shrink code by only pin-muxing items
needed for SPL in SPL and relying on driver model or SPL to mux other
items.  Unfortunately, da850evm_direct_nor doesn't use SPL so items
that were only muxed during SPL are not muxed causing the board
to no longer boot.

Signed-off-by: Adam Ford <aford173@gmail.com>