libpayload: Drop CONFIG_LP_CHROMEOS

This is adding complexity to the code more than it saves
space, plus some of the tables could potentially be interesting
outside of the ChromeOS context.

Change-Id: I4bf24608f3e26d3b7871a5031ae8f03bc2c8c21f
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/14070
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

payloads/libpayload/configs/config.arm64-generic

@@ -11,7 +11,6 @@
 # CONFIG_LP_DEVELOPER is not set
 CONFIG_LP_COMPILER_GCC=y
 # CONFIG_LP_COMPILER_LLVM_CLANG is not set
-CONFIG_LP_CHROMEOS=y
 
 #
 # Architecture Options