remoteproc: imx_rproc: Simplify clock enable logic using dcfg flags

remoteproc: imx_rproc: Simplify clock enable logic using dcfg flags

Simplify the clock enable logic by removing the dedicated
imx_rproc_clk_enable() function and integrate the clock handling directly
into the probe function to simplify the code.

Add a new IMX_RPROC_NEED_CLKS flag in dcfg to indicate whether clock
management is required for a given SoC. Update probe logic to conditionally
enable clocks based on the new flag.

Set the flag for applicable SoCs (e.g., i.MX7D, i.MX8MQ, i.MX93, etc.).

No functional changes.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20251024-imx_rproc_c4-v4-1-af83ed3fdbba@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>