ANDROID: gki_defconfig: add CONFIG_FUNCTION_ERROR_INJECTION

Commit b60a8ad7 ("error-injection: Add prompt for function error
injection") removed the "default y" selection for this option, so it
needs to be added manually to the gki_defconfig files in order to
preserve the option, AND to keep the stable ABI.

Fixes: b60a8ad7 ("error-injection: Add prompt for function error injection")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ie36b7bab650356d1bf24625961adf33a725258d2