src/mainboard/Kconfig: Add support for 10240 KiB ROM chips
The Dell Optiplex 790 desktop board has a logical 10MiB flash, so it
needs to select BOARD_ROMSIZE_KB_10240. Provide it, so it can be used.
Change-Id: I6365b0cda67fa1213c20337890157e5d658094d1
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/21863
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>