mainboard.c: Name enable_dev function uniformly `mainboard_enable`

To reduce the differences between these file name the enabling
device function in the directory `src/mainboard` uniformly
`mainboard_enable` [1].

Thanks to the awesome help of gnomon and BlastHardcheese in the
IRC channel #sed on <irc.freenode.net>. gnomon came up with the
following command to do the actual work.

    $ cd src/mainboard
    $ for f in */*/mainboard.c ; \
    > do src="$(awk '/\.enable_dev = /{v=$NF; sub(/,$/,"",v); print v}' "$f")" ; \
    > [[ -z $src ]] && continue ; \
    > printf '%s\n' "g/${src}/s/${src}\([,(]\)/mainboard_enable\1/p" w | ed -s "$f" ; \
    > done

`src/mainboard/digitallogic/msm586seg/mainboard.c` and
`src/mainboard/technologic/ts5300/mainboard.c` had to be adapted
manually as no comma was used separating the struct members.

And with the following statement, gnomon is even more likable!

    My pleasure entirely.  Good luck with coreboot; I'm a big fan of the project.

[1] http://www.coreboot.org/pipermail/coreboot/2013-February/074548.html

Change-Id: Ife9cd0c2d9cc1ed14afc6d40063450553f06a6c6
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/2493
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/mainboard/asus/m4a785-m/mainboard.c b/src/mainboard/asus/m4a785-m/mainboard.c
index a0b79fe..a36dce0 100644
--- a/src/mainboard/asus/m4a785-m/mainboard.c
+++ b/src/mainboard/asus/m4a785-m/mainboard.c
@@ -190,7 +190,7 @@
 * enable the dedicated function in this board.
 * This function called early than rs780_enable.
 *************************************************/
-static void m4a785m_enable(device_t dev)
+static void mainboard_enable(device_t dev)
 {
 	printk(BIOS_INFO, "Mainboard enable. dev=0x%p\n", dev);
 
@@ -200,5 +200,5 @@
 }
 
 struct chip_operations mainboard_ops = {
-	.enable_dev = m4a785m_enable,
+	.enable_dev = mainboard_enable,
 };