arm64: dts: meson: update spifc node name on Khadas VIM3/VIM3L

The VIM3/VIM3L Boards use w25q128 not w25q32 - this is a cosmetic change
only - the device probes fine with the current device-tree.

Fixes: 0e1610e7

 ("arm64: dts: khadas-vim3: add SPIFC controller node")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20200718054505.4165-1-christianshewitt@gmail.com