Rename getenv_r() into getenv_f()

While running from flash, i. e. before relocation, we have only a
limited C runtime environment without writable data segment. In this
phase, some configurations (for example with environment in EEPROM)
must not use the normal getenv(), but a special function.  This
function had been called getenv_r(), with the idea that the "_r"
suffix would mean the same as in the _r_eentrant versions of some of
the C library functions (for example getdate vs. getdate_r, getgrent
vs. getgrent_r, etc.).

Unfortunately this was a misleading name, as in U-Boot the "_r"
generally means "running from RAM", i. e. _after_ relocation.

To avoid confusion, rename into getenv_f() [as "running from flash"]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
diff --git a/arch/m68k/lib/board.c b/arch/m68k/lib/board.c
index 732023d..b254079 100644
--- a/arch/m68k/lib/board.c
+++ b/arch/m68k/lib/board.c
@@ -134,7 +134,7 @@
 static int init_baudrate (void)
 {
 	char tmp[64];	/* long enough for environment variables */
-	int i = getenv_r ("baudrate", tmp, sizeof (tmp));
+	int i = getenv_f("baudrate", tmp, sizeof (tmp));
 
 	gd->baudrate = (i > 0)
 			? (int) simple_strtoul (tmp, NULL, 10)
@@ -278,7 +278,7 @@
 	/*
 	 * reserve protected RAM
 	 */
-	i = getenv_r ("pram", tmp, sizeof (tmp));
+	i = getenv_f("pram", tmp, sizeof (tmp));
 	reg = (i > 0) ? simple_strtoul (tmp, NULL, 10) : CONFIG_PRAM;
 	addr -= (reg << 10);		/* size is in kB */
 	debug ("Reserving %ldk for protected RAM at %08lx\n", reg, addr);
@@ -549,7 +549,7 @@
 	 * Fill in missing fields of bd_info.
 	 * We do this here, where we have "normal" access to the
 	 * environment; we used to do this still running from ROM,
-	 * where had to use getenv_r(), which can be pretty slow when
+	 * where had to use getenv_f(), which can be pretty slow when
 	 * the environment is in EEPROM.
 	 */
 	bd->bi_ip_addr = getenv_IPaddr ("ipaddr");