ARM: dts: dra7-evm: Fix NAND GPMC timings

ARM: dts: dra7-evm: Fix NAND GPMC timings

commit 5990047cef0c6a36eefcb166bd32d99a8f95c75b upstream.

The nand timings were scaled down by 2 to account for
the 2x rate returned by clk_get_rate(gpmc_fclk).

As the clock data got fixed by [1], revert back to actual
timings (i.e. scale them up by 2).

Without this NAND doesn't work on dra7-evm.

[1] - commit dd94324b983afe114ba9e7ee3649313b451f63ce
    ARM: dts: dra7xx-clocks: Fix the l3 and l4 clock rates

Fixes: ff66a3c86e00 ("ARM: dts: dra7: add support for parallel NAND flash")
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>