dcp: Wait 25ms after enabling dcp/dptx-phy power-domains

Fixes display initialization from stage 1 m1n1. 20ms looked reliable on
j473 but let's add 25% safety margin. Someone with more motivation (and
HW serial) to do repeated `kmutil configure-boot ...` can try to
minimize this and test on t602x.

Signed-off-by: Janne Grunau <j@jannau.net>

src/dcp.c

@@ -118,6 +118,7 @@ dcp_dev_t *dcp_init(const display_config_t *cfg)
         dcp_die = cfg->die;
         pmgr_adt_power_enable(cfg->dcp);
         pmgr_adt_power_enable(cfg->dptx_phy);
+        mdelay(25);
     }
 
     int dart_node = adt_path_offset(adt, cfg->dcp_dart);