env: Rename getenv_hex(), getenv_yesno(), getenv_ulong()

We are now using an env_ prefix for environment functions. Rename these
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/cmd/fdt.c b/cmd/fdt.c
index eb01a88..118613f 100644
--- a/cmd/fdt.c
+++ b/cmd/fdt.c
@@ -111,7 +111,7 @@
 				return 1;
 			printf("The address of the fdt is %#08lx\n",
 			       control ? (ulong)map_to_sysmem(blob) :
-					getenv_hex("fdtaddr", 0));
+					env_get_hex("fdtaddr", 0));
 			return 0;
 		}
 
diff --git a/cmd/nvedit.c b/cmd/nvedit.c
index 0468a4b..4033d90 100644
--- a/cmd/nvedit.c
+++ b/cmd/nvedit.c
@@ -327,7 +327,7 @@
 	return env_set(varname, str);
 }
 
-ulong getenv_hex(const char *varname, ulong default_val)
+ulong env_get_hex(const char *varname, ulong default_val)
 {
 	const char *s;
 	ulong value;
@@ -690,7 +690,7 @@
  *			found
  * @return the decoded value, or default_val if not found
  */
-ulong getenv_ulong(const char *name, int base, ulong default_val)
+ulong env_get_ulong(const char *name, int base, ulong default_val)
 {
 	/*
 	 * We can use env_get() here, even before relocation, since the
diff --git a/cmd/source.c b/cmd/source.c
index 177f86b..a9831b6 100644
--- a/cmd/source.c
+++ b/cmd/source.c
@@ -40,7 +40,7 @@
 	size_t		fit_len;
 #endif
 
-	verify = getenv_yesno ("verify");
+	verify = env_get_yesno("verify");
 
 	buf = map_sysmem(addr, 0);
 	switch (genimg_get_format(buf)) {
diff --git a/cmd/trace.c b/cmd/trace.c
index e6c08e4..a0a7dd1 100644
--- a/cmd/trace.c
+++ b/cmd/trace.c
@@ -16,10 +16,10 @@
 	if (argc < 2)
 		return -1;
 	if (argc < 4) {
-		*buff_size = getenv_ulong("profsize", 16, 0);
-		*buff = map_sysmem(getenv_ulong("profbase", 16, 0),
+		*buff_size = env_get_ulong("profsize", 16, 0);
+		*buff = map_sysmem(env_get_ulong("profbase", 16, 0),
 				   *buff_size);
-		*buff_ptr = getenv_ulong("profoffset", 16, 0);
+		*buff_ptr = env_get_ulong("profoffset", 16, 0);
 	} else {
 		*buff_size = simple_strtoul(argv[3], NULL, 16);
 		*buff = map_sysmem(simple_strtoul(argv[2], NULL, 16),
diff --git a/cmd/ximg.c b/cmd/ximg.c
index 50dc00e..21b5c37 100644
--- a/cmd/ximg.c
+++ b/cmd/ximg.c
@@ -52,7 +52,7 @@
 #endif
 	uint8_t		comp;
 
-	verify = getenv_yesno("verify");
+	verify = env_get_yesno("verify");
 
 	if (argc > 1) {
 		addr = simple_strtoul(argv[1], NULL, 16);