The mx25l25635f supports clock speed up to 50Mhz.
Also remove obsolete "mx25l25635f" hack and rename
the matching device-tree flash node.
Signed-off-by: Dmitry Tunin <hanipouspilot@gmail.com>
[mention node rename as well. chip is very very likely
always the "f" revision for all NBG6617]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
88f39b72da