Revert "[RCAR] Fix gcc 10 build failed on u-boot and kernel."

Revert "[RCAR] Fix gcc 10 build failed on u-boot and kernel."

Bug-AGL: SPEC-3674

This reverts commit 66814faec0f8e589b48af8c22a70d94d96bf0957.

Change-Id: Iad269aac57a58d909ab5ea97110538e5a89cab80
Signed-off-by: Ronan Le Martret <ronan.lemartret@iot.bzh>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25499
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>