clk: imx: imx21: Remove clock driver
As i.MX21 support has been removed, get rid of its clock driver too. Signed-off-by: Fabio Estevam <festevam@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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