MLK-17750: drm/imx: ldb: Fix build on imx6/7

This code is enabled in upstream imx_v6_v7_defconfig but fails to build
because of sc api calls. Fix this by adding ifdef checks to pixel_link
code.

Check for CONFIG_HAVE_IMX8_SOC becuase it is selected by both 8qm and
8qx.

These calls are already guarded at runtime with checks for devtype
pixel_link_valid_quirks so the empty ifdefed functions will never get
called anyway.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>

It might make sense to add a dedicated config option for SC api
like CONFIG_HAVE_IMX_SCU, right now drivers/soc/imx/sc is guarded by
CONFIG_ARCH_FSL_IMX8QM which means you can't build 8qxp separately.

(cherry picked from commit a928239d)

drivers/gpu/drm/imx/imx-ldb.c

@@ -886,6 +886,9 @@ static int imx_ldb_panel_ddc(struct device *dev,
 	return 0;
 }
 
+#ifndef CONFIG_HAVE_IMX8_SOC
+static void ldb_pixel_link_config(int id) {}
+#else
 static void ldb_pixel_link_config(int id)
 {
 	sc_err_t sciErr;
@@ -928,6 +931,7 @@ static void ldb_pixel_link_config(int id)
 
 	sc_ipc_close(mu_id);
 }
+#endif
 
 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 {