ARM: socfpga: clk: Obtain handoff base clock via DM

Bind fixed clock driver to the base clock instantiated in the handoff
DT and use DM clock framework to get their clock rate. This replaces
the ad-hoc DT parsing present thus far.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index 80be1dc..06f8527 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -11,6 +11,8 @@
 	bool
 	select ALTERA_SDRAM
 	select SPL_BOARD_INIT if SPL
+	select CLK
+	select SPL_CLK if SPL
 	select DM_I2C
 	select DM_RESET
 	select SPL_DM_RESET if SPL