Patch merged into coreboot/master: Kconfig: Get rid of obsolete symbols

the following patch was just integrated into master:
commit c4dd3e02121f113483acb983899f8cdea3998e19
Author: Martin Roth 
Date:   Sat Jun 20 16:40:28 2015 -0600

Kconfig: Get rid of obsolete symbols

CAR_MIGRATION was removed in commit:
    cbf5bdfe - CBMEM: Always select CAR_MIGRATION

ALT_CBFS_LOAD_PAYLOAD was removed in commit:
    cf6c9cc2 - Kill ALT_CBFS_LOAD_PAYLOAD

MARK_GRAPHICS_MEM_WRCOMB was removed in commit:
    30fe6120 - MTRR: Mark all prefetchable resources as WRCOMB.

EXTERNAL_MRC_BLOB was removed in commit:
    0aede118 - Drop unused EXTERNAL_MRC_BLOB

CACHE_ROM is only in Google's codebase.
    LID_SWITCH is only in Google's codebase.
    DEFAULT_POST_DEVICE_LPC is only in Sage's codebase.
    ROMSTAGE_RTC_INIT is only in Sage's codebase, or was never used.

HUDSON_NOT_LEGACY_FREE never existed as far as I can tell.
    MAINBOARD_DO_EDID never existed as far as I can tell.

Change-Id: I636ea7584fb47885638dbcd9ccedfafb1ca2c640
    Signed-off-by: Martin Roth 
    Reviewed-on: http://review.coreboot.org/10616
    Tested-by: build bot (Jenkins)
    Reviewed-by: Marc Jones 
    Reviewed-by: Paul Menzel

See http://review.coreboot.org/10616 for details.

-gerrit