GKI: config: FW_CACHE: remove duplicated CONFIG_FW_CACHE

There are duplicated changes about "firmware_class: make firmware
caching configurable". Both created config description of
CONFIG_FW_CACHE. This change remove description on
`drivers/base/Kconfig` and disable CONFIG_FW_CACHE in defconfig

Bug: 154580242
Bug: 153823050
Signed-off-by: lucaswei <lucaswei@google.com>
Change-Id: Id66e2cb0da2a9ae36fbcb9f508af250e9af95b05