dm6467Tevm: Use a common configuration file for davinci_dm6467evm and davinci_dm6467Tevm

In commit 2d575e46859dd9127a9cec731ace77523e6ea2ab a separate header
file was introduced for the DM6467T EVM, include/configs/davinci_dm6467Tevm.h.
The substantial difference between the davinci_dm6467evm and the
davinci_dm6467Tevm configuration is a single bit in the hardware revision
that is passed to the Linux kernel and davinci_dm6467evm has
REFCLK_FREQ = 27000000 where as davinci_dm6467Tevm.h has a
REFCLK_FREQ = 33000000.

This patch removes include/configs/davinci_dm6467Tevm.h. Instead the
include/configs/davinci_dm6467evm.h configuration is used for DM6467T EVMs and
renamed CFG_REFCLK_FREQ to CONFIG_REFCLK_FREQ and CONFIG_REFCLK_FREQ is defined
in boards.cfg.

Signed-off-by: Prabhakar Lad <prabhakar.csengg@gmail.com>
Cc: Tom Rini <trini@ti.com>
diff --git a/boards.cfg b/boards.cfg
index a61422b..28cc345 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -125,8 +125,8 @@
 davinci_dm355evm             arm         arm926ejs   dm355evm            davinci        davinci
 davinci_dm355leopard         arm         arm926ejs   dm355leopard        davinci        davinci
 davinci_dm365evm             arm         arm926ejs   dm365evm            davinci        davinci
-davinci_dm6467evm            arm         arm926ejs   dm6467evm           davinci        davinci
-davinci_dm6467Tevm           arm         arm926ejs   dm6467evm           davinci        davinci
+davinci_dm6467evm            arm         arm926ejs   dm6467evm           davinci        davinci     davinci_dm6467evm:REFCLK_FREQ=27000000
+davinci_dm6467Tevm           arm         arm926ejs   dm6467evm           davinci        davinci     davinci_dm6467evm:DAVINCI_DM6467TEVM,REFCLK_FREQ=33000000
 davinci_dvevm                arm         arm926ejs   dvevm               davinci        davinci
 davinci_schmoogie            arm         arm926ejs   schmoogie           davinci        davinci
 davinci_sffsdr               arm         arm926ejs   sffsdr              davinci        davinci