Revert "u-boot: Relax KCFLAGS warnings for GCC 15" This reverts commit 7cb6c9e84defd45c599d2b7b5c812b49e9f28c5a. Reason for revert: builds fine without disabling specific compiler flags. Tested: Built all affected machine types. Google-Bug-Id: 558753346 Change-Id: I405569c370876554a9206dc7b590db7db48f7c45 Signed-off-by: Bart Van Assche <bvanassche@google.com>