disp: msm: avoid using #ifdef for configurations

Use #if IS_ENABLED() instead of #ifdef for configurations as vendor module
guidelines.

Use #if IS_ENABLED(CONFIG_XXX) instead of #ifdef CONFIG_XXX to ensure that
the code inside the #if block continues to compile if the config changes
to a tristate config in the future.

The differences are as follows:
	1.#if IS_ENABLED(CONFIG_XXX) evaluates to true when CONFIG_XXX is set to
		module (=m) or built-in (=y).
	2.#ifdef CONFIG_XXX evaluates to true when CONFIG_XXX is set to
		built-in(=y) , but doesn't when CONFIG_XXX is set to module(=m).
		Use this only when you're certain you want to do the same thing
		when the config is set to module or is disabled.

Change-Id: Ia806b9b01ad8414d0e4de027a382cb68e7fb4a6a
Signed-off-by: GG Hou <quic_renjhou@quicinc.com>

msm/dsi/dsi_ctrl.c

@@ -85,7 +85,7 @@ static const struct of_device_id msm_dsi_of_match[] = {
 	{}
 };
 
-#ifdef CONFIG_DEBUG_FS
+#if IS_ENABLED(CONFIG_DEBUG_FS)
 static ssize_t debugfs_state_info_read(struct file *file,
 				       char __user *buff,
 				       size_t count,

msm/dsi/dsi_display.c

@@ -1363,7 +1363,7 @@ int dsi_display_set_power(struct drm_connector *connector,
 	return rc;
 }
 
-#ifdef CONFIG_DEBUG_FS
+#if IS_ENABLED(CONFIG_DEBUG_FS)
 static bool dsi_display_is_te_based_esd(struct dsi_display *display)
 {
 	u32 status_mode = 0;

msm/dsi/dsi_parser.h

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2018-2021, The Linux Foundation. All rights reserved.
  */
 
@@ -10,7 +11,7 @@
 #include <linux/of_gpio.h>
 #include <linux/version.h>
 
-#ifdef CONFIG_DSI_PARSER
+#if IS_ENABLED(CONFIG_DSI_PARSER)
 void *dsi_parser_get(struct device *dev);
 void dsi_parser_put(void *data);
 int dsi_parser_dbg_init(void *parser, struct dentry *dir);