ANDROID: remove CONFIG_MODULE_SIG_PROTECT from GKI defconfig

This option will be implicitly set when a list of protected modules is
provided using CONFIG_MODULE_SIG_PROTECT_LIST option.

Bug: 393366754
Change-Id: I2cb9bd76d784013a1661bf7d713068771fa69131
Signed-off-by: Sid Nayyar <sidnayyar@google.com>