coreboot/dell: move e6400 to new tree, dell

the ddr2 fix broke *ddr3* on gm45 thinkpads in
testing, depending on memory modules. this was
established by removing patches, re-doing
configs etc, on a user's X200 (testing gentoo
and freebsd). the X200 kept randomly rebooting
or having random glitches.

the configs themselves (gm45 thinkpads) will
also be re-done, because i found minor issues
unrelated, but this patch moves dell e6400 to
its own tree. the ddr2 fix is no longer present
in coreboot/default, only coreboot/dell.

i noticed minor differences in gm45 thinkpad
configs, when re-doing the configs, versus
what are currently in lbmk master; for instance,
vbt was not enabled anymore, on thinkpad x200.
modifications to these will be done separately.

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/coreboot/e6400_4mb/config/libgfxinit_corebootfb

@@ -133,7 +133,6 @@ CONFIG_USBDEBUG_HCD_INDEX=1
 CONFIG_BOOT_DEVICE_SPI_FLASH_BUS=0
 # CONFIG_CONSOLE_POST is not set
 CONFIG_BOARD_DELL_E6400=y
-# CONFIG_BOARD_DELL_LATITUDE_E6430 is not set
 # CONFIG_BOARD_DELL_OPTIPLEX_9010 is not set
 # CONFIG_BOARD_DELL_PRECISION_T1650 is not set
 CONFIG_ECAM_MMCONF_BASE_ADDRESS=0xf0000000

config/coreboot/e6400_4mb/config/libgfxinit_txtmode

@@ -131,7 +131,6 @@ CONFIG_USBDEBUG_HCD_INDEX=1
 CONFIG_BOOT_DEVICE_SPI_FLASH_BUS=0
 # CONFIG_CONSOLE_POST is not set
 CONFIG_BOARD_DELL_E6400=y
-# CONFIG_BOARD_DELL_LATITUDE_E6430 is not set
 # CONFIG_BOARD_DELL_OPTIPLEX_9010 is not set
 # CONFIG_BOARD_DELL_PRECISION_T1650 is not set
 CONFIG_ECAM_MMCONF_BASE_ADDRESS=0xf0000000

config/coreboot/e6400_4mb/target.cfg

@@ -1,4 +1,4 @@
-tree="default"
+tree="dell"
 romtype="4MiB ICH9 IFD NOR flash"
 arch="x86_64"
 payload_grub="n"