arm: socfpga: clock: Trim down code duplication
Pull out functions to read frequency of Main clock VCO and PLL clock VCO as the code is duplicated multiple times. Signed-off-by: NMarek Vasut <marex@denx.de> Cc: Chin Liang See <clsee@altera.com> Cc: Dinh Nguyen <dinguyen@altera.com> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Cc: Tom Rini <trini@ti.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Pavel Machek <pavel@denx.de> Acked-by: NDinh Nguyen <dinguyen@opensource.altera.com> Acked-by: NPavel Machek <pavel@denx.de>
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