chore(epicardium): Factor out the display init code

Move display initialization from hardware_early_init() into the display
module to keep it closer to related functionality.

epicardium/drivers/display/init.c

+#include "drivers/display/lcd.h"
+#include "display.h"
+
+void disp_init(void)
+{
+	/*
+	 * This call can be removed once all gfx stuff is replaced.
+	 */
+	display_init_slim();
+
+	/*
+	 * The bootloader has already initialized the display, so we only need
+	 * to do the bare minimum here.
+	 */
+	lcd_reconfigure();
+}

epicardium/drivers/drivers.h

@@ -59,6 +59,8 @@ int pmic_read_amux(enum pmic_amux_signal sig, float *result);
 
 
 /* ---------- Display ------------------------------------------------------ */
+/* Do display and graphics initialization/configuration. */
+void disp_init(void);
 /* Forces an unlock of the display. Only to be used in Epicardium */
 void disp_forcelock();
 void disp_update_backlight_clock(void);

epicardium/drivers/meson.build

@@ -20,4 +20,5 @@ driver_sources = files(
 
   'display/lcd.c',
   'display/api.c',
+  'display/init.c',
 )

epicardium/modules/hardware.c

@@ -9,10 +9,8 @@
 #include "drivers/drivers.h"
 #include "user_core/interrupts.h"
 #include "user_core/user_core.h"
-#include "drivers/display/lcd.h"
 
 #include "card10.h"
-#include "display.h"
 #include "leds.h"
 #include "pb.h"
 #include "pmic.h"
@@ -114,15 +112,9 @@ int hardware_early_init(void)
 	}
 
 	/*
-	 * This call can be removed once all gfx stuff is replaced.
-	 */
-	display_init_slim();
-
-	/*
-	 * The bootloader has already initialized the display, so we only need
-	 * to do the bare minimum here.
+	 * Display
 	 */
-	lcd_reconfigure();
+	disp_init();
 
 	/*
 	 * RGB LEDs
@@ -278,7 +270,7 @@ int hardware_reset(void)
 	/*
 	 * Display
 	 */
-	display_init_slim();
+	disp_init();
 	epic_disp_backlight(20);
 
 	/*