env: Rename setenv() to env_set()

We are now using an env_ prefix for environment functions. Rename setenv()
for consistency. Also add function comments in common.h.

Suggested-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/toradex/apalis_imx6/apalis_imx6.c b/board/toradex/apalis_imx6/apalis_imx6.c
index e41547b..86a7a15 100644
--- a/board/toradex/apalis_imx6/apalis_imx6.c
+++ b/board/toradex/apalis_imx6/apalis_imx6.c
@@ -804,7 +804,7 @@
 
 	rev = get_board_rev();
 	snprintf(env_str, ARRAY_SIZE(env_str), "%.4x", rev);
-	setenv("board_rev", env_str);
+	env_set("board_rev", env_str);
 
 #ifndef CONFIG_TDX_APALIS_IMX6_V1_0
 	if ((rev & 0xfff0) == 0x0100) {
@@ -816,7 +816,7 @@
 		/* if using the default device tree, use version for V1.0 HW */
 		fdt_env = getenv("fdt_file");
 		if ((fdt_env != NULL) && (strcmp(FDT_FILE, fdt_env) == 0)) {
-			setenv("fdt_file", FDT_FILE_V1_0);
+			env_set("fdt_file", FDT_FILE_V1_0);
 			printf("patching fdt_file to " FDT_FILE_V1_0 "\n");
 #ifndef CONFIG_ENV_IS_NOWHERE
 			env_save();
diff --git a/board/toradex/colibri_imx6/colibri_imx6.c b/board/toradex/colibri_imx6/colibri_imx6.c
index cbf7aa9..dbcd233 100644
--- a/board/toradex/colibri_imx6/colibri_imx6.c
+++ b/board/toradex/colibri_imx6/colibri_imx6.c
@@ -676,7 +676,7 @@
 
 	rev = get_board_rev();
 	snprintf(env_str, ARRAY_SIZE(env_str), "%.4x", rev);
-	setenv("board_rev", env_str);
+	env_set("board_rev", env_str);
 #endif
 
 	return 0;
diff --git a/board/toradex/colibri_vf/colibri_vf.c b/board/toradex/colibri_vf/colibri_vf.c
index 46dd15b..3858af9 100644
--- a/board/toradex/colibri_vf/colibri_vf.c
+++ b/board/toradex/colibri_vf/colibri_vf.c
@@ -535,7 +535,7 @@
 	if (((src->sbmr2 & SRC_SBMR2_BMOD_MASK) >> SRC_SBMR2_BMOD_SHIFT)
 			== SRC_SBMR2_BMOD_SERIAL) {
 		printf("Serial Downloader recovery mode, disable autoboot\n");
-		setenv("bootdelay", "-1");
+		env_set("bootdelay", "-1");
 	}
 
 	return 0;
diff --git a/board/toradex/common/tdx-common.c b/board/toradex/common/tdx-common.c
index 0d26787..77ebb88 100644
--- a/board/toradex/common/tdx-common.c
+++ b/board/toradex/common/tdx-common.c
@@ -80,7 +80,7 @@
 		tdx_hw_tag.ver_minor,
 		(char)tdx_hw_tag.ver_assembly + 'A');
 
-	setenv("serial#", tdx_serial_str);
+	env_set("serial#", tdx_serial_str);
 
 	/*
 	 * Check if environment contains a valid MAC address,