remoteproc: imx_rproc: Remove enum imx_rproc_method

There is no user of enum imx_rproc_method after moved to ops based
method. Remove it.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Tested-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20251119-imx-dsp-2025-11-19-v4-11-adafd342d07b@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: MrVan

drivers/remoteproc/imx_rproc.h

@@ -15,13 +15,6 @@ struct imx_rproc_att {
 	int flags;
 };
 
-/* Remote core start/stop method */
-enum imx_rproc_method {
-	IMX_RPROC_NONE,
-	/* Through ARM SMCCC */
-	IMX_RPROC_SMC,
-};
-
 /* dcfg flags */
 #define IMX_RPROC_NEED_SYSTEM_OFF	BIT(0)
 #define IMX_RPROC_NEED_CLKS		BIT(1)
@@ -42,7 +35,6 @@ struct imx_rproc_dcfg {
 	u32				gpr_wait;
 	const struct imx_rproc_att	*att;
 	size_t				att_size;
-	enum imx_rproc_method		method;
 	u32				flags;
 	const struct imx_rproc_plat_ops	*ops;
 };