clk: ti: omap34xx: move omap34xx clock type support code to clock driver

clk: ti: omap34xx: move omap34xx clock type support code to clock driver

With the legacy clock data gone, this is no longer needed under platform,
so move it under the clock driver itself. Remove unnecessary declarations
from the TI clock header also.

Signed-off-by: Tero Kristo <t-kristo@ti.com>