main/linux-headers: remove stray fix-little_endian.patch

according git log this file was never used
7 jobs for !1604 with linux-headers-rm-stray-patch in 1 minute and 3 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #17240
docker-alpine x86_64
lint

00:00:26

 
  Build
passed #17245
docker-alpine ci-build aarch64
build-aarch64

00:00:31

passed #17246
docker-alpine ci-build armv7
build-armv7

00:00:35

passed #17244
docker-alpine ci-build ppc64le
build-ppc64le

00:00:32

passed #17243
docker-alpine ci-build s390x
build-s390x

00:00:20

passed #17242
docker-alpine ci-build x86
build-x86

00:00:28

passed #17241
docker-alpine ci-build x86_64
build-x86_64

00:00:24