drm/ast: Move Gen4+ POST code to separate source file

Move POST code for Gen4+ to separate source file and hide it in
ast_2300_post(). With P2A configuration, it performs a full board
POST and enables the transmitter chip; otherwise it only enables the
transmitter chip.

Also fix coding style in several places. No changes to the overall
logic.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250706162816.211552-5-tzimmermann@suse.de

drivers/gpu/drm/ast/Makefile

@@ -4,6 +4,7 @@
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
 
 ast-y := \
+	ast_2300.o \
 	ast_2500.o \
 	ast_2600.o \
 	ast_cursor.o \

drivers/gpu/drm/ast/ast_drv.h

@@ -417,6 +417,9 @@ struct ast_crtc_state {
 
 int ast_mm_init(struct ast_device *ast);
 
+/* ast_2300.c */
+int ast_2300_post(struct ast_device *ast);
+
 /* ast_2500.c */
 void ast_2500_patch_ahb(void __iomem *regs);
 int ast_2500_post(struct ast_device *ast);