arm: socfpga: clock: Add code to read clock configuration
Add the entire bulk of code to read out clock configuration from the SoCFPGA CPU registers. This is important for MMC, QSPI and UART drivers as otherwise they cannot determine the frequency of their upstream clock. Signed-off-by: NPavel Machek <pavel@denx.de> 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> V2: Fixed the L4 MP clock divider and synced the clock code with latest rocketboards codebase (thanks Dinh for pointing this out)
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