kernel: fix KERNEL_TOOLCHAIN_PATH_gcc and usage
Previously, this would be a full compile prefix (e.g. prebuilts/gcc/.../bin/aarch64-linux-gnu-). Since we're adding this to PATH, it only needs to be prebuilts/gcc/.../bin. Also remove the extra /bin/ added by kernel.mk. Change-Id: If2490729128c0243c61de646f6c8e19a15c8dc1c
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