Rename CONFIG_SYS_INIT_RAM_END into CONFIG_SYS_INIT_RAM_SIZE

CONFIG_SYS_INIT_RAM_END was a misnomer as it suggests this might be
some end address; to make the meaning more clear we rename it into
CONFIG_SYS_INIT_RAM_SIZE

No other code changes are performed in this patch, only minor editing
of white space (due to the changed length) and the comments was done,
where noticed.

Note that the code for the PATI and cmi_mpc5xx board configurations
looks seriously broken.  Last known maintainers on Cc:

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Denis Peter <d.peter@mpl.ch>
Cc: Martin Winistoerfer <martinwinistoerfer@gmx.ch>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/README b/README
index a507a1f..3d87423 100644
--- a/README
+++ b/README
@@ -2686,7 +2686,7 @@
 		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
 		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
 		data is located at the end of the available space
-		(sometimes written as (CONFIG_SYS_INIT_RAM_END -
+		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
 		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
 		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
 		CONFIG_SYS_GBL_DATA_OFFSET) downward.