ramips: fix wrong blocksizes

ramips: fix wrong blocksizes

The D-Link DIR-860L B1 has a flash chip which doesn't support
4K sectors. Since the DIR-860L B1 was the only mt7621 board which had
the 4k blocksize set, the 4K sector support is removed from the kernel
config.

I've checked the flash chips of all boards having set a 4K blocksize
again. This time I searched harder to finding bootlogs instead of
relying on wikis articles and/or the device tree source file.

The Planex MZK-DP150N has an en25q32b instead of the mentioned one in
the dts. Albeit the en25q32b supports 4K sectors, 4K support is not
enabled in the driver. Change the blocksize for this board back to 64K.

Reported-by: Russell Senior <russell@personaltelco.net>
Signed-off-by: Mathias Kresin <dev@kresin.me>